US3027865A - Clogged filter indicator - Google Patents

Clogged filter indicator Download PDF

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Publication number
US3027865A
US3027865A US785212A US78521259A US3027865A US 3027865 A US3027865 A US 3027865A US 785212 A US785212 A US 785212A US 78521259 A US78521259 A US 78521259A US 3027865 A US3027865 A US 3027865A
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Prior art keywords
diaphragm
filter
conduit
base
pressure
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US785212A
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Murrell F Kautz
Elwyn H Olson
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Honeywell Inc
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Honeywell Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
    • F02M35/09—Clogging indicators ; Diagnosis or testing of air cleaners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S116/00—Signals and indicators
    • Y10S116/42—Oil filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/34—Indicator and controllers

Definitions

  • the present invention is concerned with an improvement in a filter condition responsive device; in particular, in a device having a diaphragm for sensing the pressure across a filter in a forced air conditioning system, the diaphragm has a rigid center portion with a latch member attached slightly below the center of the diaphragm which is first to operate upon a slight change in the pressure across the diaphragm.
  • the present invention is concerned with an improvement in such pressure responsive devices which increases the accuracy of the device and yet provides for simplicity and therefore low cost of manufacture.
  • An object of the present invention is to provide an im- 2 proved filter condition responsive device.
  • Another object of the present invention is to provide a filter condition responsive device having a diaphragm with a center portion carrying a signal latching device which pivots about one edge upon a change in the pressure to insure that the opposite edge is first to move upon a slight change in pressure to operate the latching device.
  • FIGURE 1 is a front view of the filter condition responsive device.
  • FIGURE 2 is a side cross sectional view of the device as shown in FIGURE 1.
  • FIGURE 3 is a front view of the base of the condition responsive device of FIGURE 1 with the cover removed.
  • FIGURE 4 is an enlarged cross sectional fragmentary view of the pressure responsive diaphragm of the conditioning device as shown in FIGURE 2.
  • FIGURE 1 one embodiment of a filter condition responsive device is shown indicating visually the presence of a dirty or clogged filter.
  • a chamber defining base 11 has a hollow cover 11.
  • a window 12 in the cover is transparent; so that, when a flag or indicating device 13 is in a lower position, the presence of a dirty filter is visually indicated.
  • a reset knob 14 projecting from the front cover is turned in a clockwise direction, the flag is moved upward to reset the device.
  • a set screw 15 is used to adjust the spring tension on the device for calibration purposes.
  • flag 13 When the device of FIGURE 1 is mounted on a panel and connected to a forced air conditioning system to respond to the pressure drop across a filter in the conditioning system, flag 13 will drop if the pressure reaches a predetermined value as determined by the position of set screw 15. After the flag 13 is seen in the lower position, the homeowner would change the filter and reset the condition responsive device by turning knob 14 clockwise to lift flag 13 upward in a relatched position.
  • FIGURE 2 a cross sectional side view of the device of FIGURE 1 is shown.
  • a latch or ledge 20 which is attached to a flexible diaphragm 16 (shown in FIGURES 3 and 4) contained in the base 10, is held to the right by a force applied to the diaphragm by a spring 21 which is connected between an adjustable member 22 and a projecting ear 23 also attached to the diaphragm.
  • knob 14 When knob 14 is turned clockwise, an offset crank 24 attached to the knob engages flag 13 near its pivoted connection 25 to lift the flag to rest on latch member 20 in the position shown by the dotted lines.
  • conduit When base 10 is mounted on a panel, conduit is connected to the space on one side of the filter in a conditioning system such as a forced air heating system. The pressure in the chamber is then reflected to the underside of the diaphragm.
  • a conditioning system such as a forced air heating system.
  • the pressure in the chamber is then reflected to the underside of the diaphragm.
  • One manner of connecting the invention is to connect conduit 30 downstream the filter in a forcedair heating system when the fan is used to suck air through the filter and force the air into the space being heated.
  • the filter becomes dirty, the air is restricted in its movement through the filter and a partial vacuum is established downstream the filter. This partial vacuum is applied to the chamber or cavity on underside of the diaphragm to move the diaphragm to the left and unlatch flag 13.
  • an electric signal is available when flag 13 drops.
  • 'A pair of metal contact springs 31 and 32 as shown in FIGURE 3 extend from the base.
  • the flag acts as a shorting bar to'electrically connect the springs 31 and 32.
  • the springs are connected in a conventional signal circuit having a power source and an indicating operator or light by means of terminals 33 and 34, an electric signal is available upon the presence of a dirty filter.
  • diaphragm 16 is shown stretched across an opening or chamber 17 in base 10.
  • the clamping washer has a pair of projections or stops 41 and 42 extending downward from the upper edge to protrude out over diaphragm 16.
  • a member 45 which contains latch 20 and a pair of projecting portions 50 and 51 is also attached to the diaphragm by means of rivet 44.
  • the latch member is located below the center of the diaphragm, and projecting portions 50 and 51 are above the center portion of the diaphragm so as to contact projections 41 and 42 respectively when the diaphragm is moved away from the base or outward as shown in FIGURE 3.
  • Projecting ear 23 is connected to member 45; so that, the tension available from spring 21 pulls member 45 outward as shown in FIGURE 3; so that, projections 50 and 51 engage the underside of projections or fingers 41 and 42, respectively tending to pivot the rigid portion of the diaphragm formed by washers 47 and 43 in a clockwise direction as shown in FIGURE 4.
  • spring 21 The tension on spring 21 is adjusted by the position of member 22 as shown in FIGURE 2.
  • Member 22 can be moved horizontally back and forth along the guide rail or slot 55 by screw 15.
  • Spring 60 maintains screw 15 to the left; so that, the head of the screw is held against cover 11.
  • the upper portion of the diaphragm might be first to move. Such would require a greater change in the pressure in conduit 30 before the lower portion of the diaphragm moved to release flag 13.
  • pressure changes such as developed across a dirty filter in a forced air conditioning system are being sensed, a small irregularity in the sensing device is notdesired. If too great a pressure difference across the filter is required to operate the responsive device, the filter may be too dirty and cut down the efiiciency of the conditioning system.
  • the present design provides a very accurate responsive device.
  • both sides of the diaphragm may be connected to the spaces on each side of the filter.
  • a second conduit or opening 70 provides a connection between the space under air tight cover 11 or on the right side of the diaphragm as shown in FIGURE 2 and the conditioning system. Normally this conduit would be closed off, but when desired, the conduit can be opened by removing a thin section.
  • a clogged filter indicator comprising a conduit, adapted for connection at one end to a duct between a. filter and a source of negative pressure, said conduit having a chamber-defining base on its opposite end, a flexible diaphragm connected to said chamber-defining base and forming with said base a chamber, a cover having a window therein over said diaphragm, said diaphragm having a member with a ledge on the side thereof opposite said chamber and an indicatingdevice pivoted on said cover and having contact with said ledge, whereby when said diaphragm is urged toward said conduit due to increased negative pressure therein, said indicating device will drop from said ledge and be visible to our observer, through said window.
  • said indicating device comprises a conducting member and a pair of electrical terminals connected to said base so that upon said indicating device dropping to engage said terminals a close electrical circuit for signal purposes is provided.

Description

M. F. KAUTZ ETAL 3,027,865
CLOGGED FILTER INDICATOR April 3, 1962 Filed Jan. 6, 1959 F INVENTOR.
3 MURRELL F. KAUTZ ELWYN H. OLSON ATTORNEY 3,027,865 Patented Apr. 3, 1962 3,027,865 CLGGGED FILTER INDICATOR lllurrell F. Kautz, Minneapolis, and Elwyn H. Olson, St. Paul, Minn, assignors to Minneapolis-Honeywell Regulator Company, Minneapolis, Minn., a corporation of Delaware Filed Jan. 6, 1959, Ser. No. 785,212 6 Claims. (Cl. 116-114) The present invention is concerned with an improvement in a filter condition responsive device; in particular, in a device having a diaphragm for sensing the pressure across a filter in a forced air conditioning system, the diaphragm has a rigid center portion with a latch member attached slightly below the center of the diaphragm which is first to operate upon a slight change in the pressure across the diaphragm.
The present invention is concerned with an improvement in such pressure responsive devices which increases the accuracy of the device and yet provides for simplicity and therefore low cost of manufacture.
An object of the present invention is to provide an im- 2 proved filter condition responsive device.
Another object of the present invention is to provide a filter condition responsive device having a diaphragm with a center portion carrying a signal latching device which pivots about one edge upon a change in the pressure to insure that the opposite edge is first to move upon a slight change in pressure to operate the latching device.
These and other objects of the present invention will become apparent upon the study of the following specification and drawing of which:
FIGURE 1 is a front view of the filter condition responsive device.
FIGURE 2 is a side cross sectional view of the device as shown in FIGURE 1.
FIGURE 3 is a front view of the base of the condition responsive device of FIGURE 1 with the cover removed.
FIGURE 4 is an enlarged cross sectional fragmentary view of the pressure responsive diaphragm of the conditioning device as shown in FIGURE 2.
Refeiring to FIGURE 1, one embodiment of a filter condition responsive device is shown indicating visually the presence of a dirty or clogged filter. A chamber defining base 11) has a hollow cover 11. A window 12 in the cover is transparent; so that, when a flag or indicating device 13 is in a lower position, the presence of a dirty filter is visually indicated. When a reset knob 14 projecting from the front cover is turned in a clockwise direction, the flag is moved upward to reset the device. A set screw 15 is used to adjust the spring tension on the device for calibration purposes. When the device of FIGURE 1 is mounted on a panel and connected to a forced air conditioning system to respond to the pressure drop across a filter in the conditioning system, flag 13 will drop if the pressure reaches a predetermined value as determined by the position of set screw 15. After the flag 13 is seen in the lower position, the homeowner would change the filter and reset the condition responsive device by turning knob 14 clockwise to lift flag 13 upward in a relatched position.
Referring to FIGURE 2, a cross sectional side view of the device of FIGURE 1 is shown. A latch or ledge 20, which is attached to a flexible diaphragm 16 (shown in FIGURES 3 and 4) contained in the base 10, is held to the right by a force applied to the diaphragm by a spring 21 which is connected between an adjustable member 22 and a projecting ear 23 also attached to the diaphragm. When knob 14 is turned clockwise, an offset crank 24 attached to the knob engages flag 13 near its pivoted connection 25 to lift the flag to rest on latch member 20 in the position shown by the dotted lines.
When base 10 is mounted on a panel, conduit is connected to the space on one side of the filter in a conditioning system such as a forced air heating system. The pressure in the chamber is then reflected to the underside of the diaphragm. One manner of connecting the invention is to connect conduit 30 downstream the filter in a forcedair heating system when the fan is used to suck air through the filter and force the air into the space being heated. As the filter becomes dirty, the air is restricted in its movement through the filter and a partial vacuum is established downstream the filter. This partial vacuum is applied to the chamber or cavity on underside of the diaphragm to move the diaphragm to the left and unlatch flag 13.
In addition to 'a visual indication, an electric signal is available when flag 13 drops. 'A pair of metal contact springs 31 and 32 as shown in FIGURE 3 extend from the base. When the metal flag 13 drops in the position as shown in FIGURE 2, the flag acts as a shorting bar to'electrically connect the springs 31 and 32. When the springs are connected in a conventional signal circuit having a power source and an indicating operator or light by means of terminals 33 and 34, an electric signal is available upon the presence of a dirty filter.
Referring to FIGURE 3, diaphragm 16 is shown stretched across an opening or chamber 17 in base 10.
' into base 10. The clamping washer has a pair of projections or stops 41 and 42 extending downward from the upper edge to protrude out over diaphragm 16.
A pair of washers 47 and 43, as shown in FIGURE 4,
diaphragm to form a nonflexible or rigid center portion for the diaphragm. The washers are connected by means of rivet 44 through the center of the diaphragm. A member 45 which contains latch 20 and a pair of projecting portions 50 and 51 is also attached to the diaphragm by means of rivet 44. The latch member is located below the center of the diaphragm, and projecting portions 50 and 51 are above the center portion of the diaphragm so as to contact projections 41 and 42 respectively when the diaphragm is moved away from the base or outward as shown in FIGURE 3. Projecting ear 23 is connected to member 45; so that, the tension available from spring 21 pulls member 45 outward as shown in FIGURE 3; so that, projections 50 and 51 engage the underside of projections or fingers 41 and 42, respectively tending to pivot the rigid portion of the diaphragm formed by washers 47 and 43 in a clockwise direction as shown in FIGURE 4.
The tension on spring 21 is adjusted by the position of member 22 as shown in FIGURE 2. Member 22 can be moved horizontally back and forth along the guide rail or slot 55 by screw 15. Spring 60 maintains screw 15 to the left; so that, the head of the screw is held against cover 11.
Referring to FIGURE 4, a partial vacuum or an increasing negative pressure developed in conduit 30 and thus in chamber 17 on the left side of diaphragm 16 would tend to move the diaphragm to the left. Since the spring 21 provides a tension on the rigid portion of diaphragm 16 to hold projections 50 and 51. against the stops, the lower portion of washers 47 and 43 will be the first to move. The first movement causes latch 20 to move to the left to release flag '13. Without the pivotal connection between members 50 and 51 and projections 41 and 42, and the spring bias produced by spring 21 above the center of the diaphragm, a drop in the pressure in conduit 30 would not insure movement of latch 20 with any accurate regularity. For example without the stops connection, the upper portion of the diaphragm might be first to move. Such would require a greater change in the pressure in conduit 30 before the lower portion of the diaphragm moved to release flag 13. When pressure changes such as developed across a dirty filter in a forced air conditioning system are being sensed, a small irregularity in the sensing device is notdesired. If too great a pressure difference across the filter is required to operate the responsive device, the filter may be too dirty and cut down the efiiciency of the conditioning system. The present design provides a very accurate responsive device.
Under certain applications both sides of the diaphragm may be connected to the spaces on each side of the filter. A second conduit or opening 70 provides a connection between the space under air tight cover 11 or on the right side of the diaphragm as shown in FIGURE 2 and the conditioning system. Normally this conduit would be closed off, but when desired, the conduit can be opened by removing a thin section.
The invention has been described in one embodiment; however, the invention is intended only to be limited by the scope of the appended claims in which we claim:
1. A clogged filter indicator comprising a conduit, adapted for connection at one end to a duct between a. filter and a source of negative pressure, said conduit having a chamber-defining base on its opposite end, a flexible diaphragm connected to said chamber-defining base and forming with said base a chamber, a cover having a window therein over said diaphragm, said diaphragm having a member with a ledge on the side thereof opposite said chamber and an indicatingdevice pivoted on said cover and having contact with said ledge, whereby when said diaphragm is urged toward said conduit due to increased negative pressure therein, said indicating device will drop from said ledge and be visible to our observer, through said window.
2. The combination according to claim 1 wherein said cover forms a second chamber and a second conduit in said base connects to said second chamber so that a pressure differential across said filter is applied to said diaphragm through said first mentioned conduit and said second conduit.
3. The combination according to claim 1 wherein said member on said diaphragm has an upper portion which engages a portion of said base, and a spring connected between said cover and said member above a center of said diaphragm to bias said diaphragm and said member toward said cover so that upon an increase in said negative pressure said member pivots about said upper portion to move said ledge away from said indicator.
4. The combination according to claim 3 wherein said upper portion has two spaced projecting members which engage two spaced projecting members on said base'to provide a two point pivot for said member when said member is moved away from said cover by an increase in negative pressure.
5. The combination according to claim 1 wherein said member is biased toward said cover by a spring connected between a projection on said member above a center of said diaphragm and an adjustable connection on said cover so that the negative pressure needed to move said member toward said base can be selected by the tension on said spring.
6. The combination according to claim 1 wherein said indicating device comprises a conducting member and a pair of electrical terminals connected to said base so that upon said indicating device dropping to engage said terminals a close electrical circuit for signal purposes is provided.
References Cited in the file of this patent UNITED STATES PATENTS
US785212A 1959-01-06 1959-01-06 Clogged filter indicator Expired - Lifetime US3027865A (en)

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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556043A (en) * 1968-12-16 1971-01-19 Ambac Ind Filter gauge
US4321070A (en) * 1980-08-22 1982-03-23 Bede Industries, Inc. Whistle to signal clogged air filter
US4488547A (en) * 1982-09-07 1984-12-18 Kenneth R. Bowers, Jr. Face mask
US4491458A (en) * 1983-03-28 1985-01-01 The Air Preheater Company, Inc. Method for detecting an overload of a fabric filter
US4610703A (en) * 1986-01-31 1986-09-09 Thaddeus Kowalczyk Air purifier for protecting motor vechicle occupants from pollution
US4696225A (en) * 1985-06-07 1987-09-29 Daimler-Benz Aktiengesellschaft Air filter arrangement for vehicle air-conditioning system
US4701193A (en) * 1985-09-11 1987-10-20 Xanar, Inc. Smoke evacuator system for use in laser surgery
US4747364A (en) * 1986-08-05 1988-05-31 Filter Alert Corporation Flow rate threshold sensor
US5917141A (en) * 1998-01-12 1999-06-29 Naquin, Jr.; Clyde J. Air filter monitoring device
US6110260A (en) * 1998-07-14 2000-08-29 3M Innovative Properties Company Filter having a change indicator
US6186140B1 (en) 1997-03-14 2001-02-13 3M Innovative Properties Company Respiratory filter element having a storage device for keeping track of filter usage and a system for use therewith
US6190442B1 (en) * 1999-08-31 2001-02-20 Tishken Products Co. Air filter gauge
US20060036349A1 (en) * 2004-08-11 2006-02-16 Lawrence Kates Method and apparatus for load reduction in an electric power system
US20060032379A1 (en) * 2004-08-11 2006-02-16 Lawrence Kates Air filter monitoring system
US20060051474A1 (en) * 2004-09-08 2006-03-09 Norman Burr Furlong Protein-enriched nut butter compositions and methods for preparing same
US20060144232A1 (en) * 2005-01-04 2006-07-06 Carrier Corporation Method for detecting a fault in an HVAC system
US20060163127A1 (en) * 2005-01-21 2006-07-27 Engineered Products Co. Fluid flow restriction indicator
US20060201168A1 (en) * 2004-08-11 2006-09-14 Lawrence Kates Method and apparatus for monitoring a calibrated condenser unit in a refrigerant-cycle system
US20070079589A1 (en) * 2005-10-11 2007-04-12 Black & Decker Inc. Gas concrete saw filtration system
US20080072687A1 (en) * 2006-06-16 2008-03-27 Engineered Products Company Dial-type flow-restriction gauges
US20090120298A1 (en) * 2007-11-11 2009-05-14 Chieh-Yuan Cheng Air filter having function of indicating choked conditions
US20110112814A1 (en) * 2009-11-11 2011-05-12 Emerson Retail Services, Inc. Refrigerant leak detection system and method
US8964338B2 (en) 2012-01-11 2015-02-24 Emerson Climate Technologies, Inc. System and method for compressor motor protection
US9121407B2 (en) 2004-04-27 2015-09-01 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system and method
US9140728B2 (en) 2007-11-02 2015-09-22 Emerson Climate Technologies, Inc. Compressor sensor module
US9285802B2 (en) 2011-02-28 2016-03-15 Emerson Electric Co. Residential solutions HVAC monitoring and diagnosis
US9310094B2 (en) 2007-07-30 2016-04-12 Emerson Climate Technologies, Inc. Portable method and apparatus for monitoring refrigerant-cycle systems
US9310439B2 (en) 2012-09-25 2016-04-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
US9551504B2 (en) 2013-03-15 2017-01-24 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9638436B2 (en) 2013-03-15 2017-05-02 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9765979B2 (en) 2013-04-05 2017-09-19 Emerson Climate Technologies, Inc. Heat-pump system with refrigerant charge diagnostics
US9803902B2 (en) 2013-03-15 2017-10-31 Emerson Climate Technologies, Inc. System for refrigerant charge verification using two condenser coil temperatures
US9823632B2 (en) 2006-09-07 2017-11-21 Emerson Climate Technologies, Inc. Compressor data module
US9833734B2 (en) 2013-12-17 2017-12-05 3M Innovative Properties Company Air quality indicator
US9885507B2 (en) 2006-07-19 2018-02-06 Emerson Climate Technologies, Inc. Protection and diagnostic module for a refrigeration system
DE102017210270A1 (en) * 2017-06-20 2018-12-20 Mahle International Gmbh Air filter element with integrated contamination measurement
US10286349B2 (en) 2015-11-10 2019-05-14 3M Innovative Properties Company Air filter use indicators
USD950698S1 (en) 2019-09-09 2022-05-03 Cleanair.Ai Corporation Filter assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505118A (en) * 1944-12-26 1950-04-25 Bendix Aviat Corp Pressure gauge
US2700362A (en) * 1952-11-01 1955-01-25 Int Harvester Co Air conditioner filter indicator
US2815733A (en) * 1955-08-19 1957-12-10 Whirlpool Co Suction indicator for vacuum cleaner
US2921157A (en) * 1955-05-26 1960-01-12 Bacharach Ind Instr Company Filter gauge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505118A (en) * 1944-12-26 1950-04-25 Bendix Aviat Corp Pressure gauge
US2700362A (en) * 1952-11-01 1955-01-25 Int Harvester Co Air conditioner filter indicator
US2921157A (en) * 1955-05-26 1960-01-12 Bacharach Ind Instr Company Filter gauge
US2815733A (en) * 1955-08-19 1957-12-10 Whirlpool Co Suction indicator for vacuum cleaner

Cited By (88)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556043A (en) * 1968-12-16 1971-01-19 Ambac Ind Filter gauge
US4321070A (en) * 1980-08-22 1982-03-23 Bede Industries, Inc. Whistle to signal clogged air filter
US4488547A (en) * 1982-09-07 1984-12-18 Kenneth R. Bowers, Jr. Face mask
US4491458A (en) * 1983-03-28 1985-01-01 The Air Preheater Company, Inc. Method for detecting an overload of a fabric filter
US4696225A (en) * 1985-06-07 1987-09-29 Daimler-Benz Aktiengesellschaft Air filter arrangement for vehicle air-conditioning system
US4701193A (en) * 1985-09-11 1987-10-20 Xanar, Inc. Smoke evacuator system for use in laser surgery
US4610703A (en) * 1986-01-31 1986-09-09 Thaddeus Kowalczyk Air purifier for protecting motor vechicle occupants from pollution
US4747364A (en) * 1986-08-05 1988-05-31 Filter Alert Corporation Flow rate threshold sensor
US6186140B1 (en) 1997-03-14 2001-02-13 3M Innovative Properties Company Respiratory filter element having a storage device for keeping track of filter usage and a system for use therewith
US5917141A (en) * 1998-01-12 1999-06-29 Naquin, Jr.; Clyde J. Air filter monitoring device
US6110260A (en) * 1998-07-14 2000-08-29 3M Innovative Properties Company Filter having a change indicator
US6190442B1 (en) * 1999-08-31 2001-02-20 Tishken Products Co. Air filter gauge
US10335906B2 (en) 2004-04-27 2019-07-02 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system and method
US9121407B2 (en) 2004-04-27 2015-09-01 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system and method
US9669498B2 (en) 2004-04-27 2017-06-06 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system and method
US20080016888A1 (en) * 2004-08-11 2008-01-24 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US7469546B2 (en) 2004-08-11 2008-12-30 Lawrence Kates Method and apparatus for monitoring a calibrated condenser unit in a refrigerant-cycle system
US9081394B2 (en) 2004-08-11 2015-07-14 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US20060196197A1 (en) * 2004-08-11 2006-09-07 Lawrence Kates Intelligent thermostat system for load monitoring a refrigerant-cycle apparatus
US20060196196A1 (en) * 2004-08-11 2006-09-07 Lawrence Kates Method and apparatus for airflow monitoring refrigerant-cycle systems
US20060201168A1 (en) * 2004-08-11 2006-09-14 Lawrence Kates Method and apparatus for monitoring a calibrated condenser unit in a refrigerant-cycle system
US7201006B2 (en) 2004-08-11 2007-04-10 Lawrence Kates Method and apparatus for monitoring air-exchange evaporation in a refrigerant-cycle system
US9046900B2 (en) 2004-08-11 2015-06-02 Emerson Climate Technologies, Inc. Method and apparatus for monitoring refrigeration-cycle systems
US7244294B2 (en) * 2004-08-11 2007-07-17 Lawrence Kates Air filter monitoring system
US7275377B2 (en) 2004-08-11 2007-10-02 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US20080015797A1 (en) * 2004-08-11 2008-01-17 Lawrence Kates Air filter monitoring system
US9086704B2 (en) 2004-08-11 2015-07-21 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US7331187B2 (en) 2004-08-11 2008-02-19 Lawrence Kates Intelligent thermostat system for monitoring a refrigerant-cycle apparatus
US20080051945A1 (en) * 2004-08-11 2008-02-28 Lawrence Kates Method and apparatus for load reduction in an electric power system
US7343751B2 (en) 2004-08-11 2008-03-18 Lawrence Kates Intelligent thermostat system for load monitoring a refrigerant-cycle apparatus
US10558229B2 (en) 2004-08-11 2020-02-11 Emerson Climate Technologies Inc. Method and apparatus for monitoring refrigeration-cycle systems
US7424343B2 (en) 2004-08-11 2008-09-09 Lawrence Kates Method and apparatus for load reduction in an electric power system
US20080216495A1 (en) * 2004-08-11 2008-09-11 Lawrence Kates Intelligent thermostat system for load monitoring a refrigerant-cycle apparatus
US20080223051A1 (en) * 2004-08-11 2008-09-18 Lawrence Kates Intelligent thermostat system for monitoring a refrigerant-cycle apparatus
US9021819B2 (en) 2004-08-11 2015-05-05 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US9023136B2 (en) 2004-08-11 2015-05-05 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US9017461B2 (en) 2004-08-11 2015-04-28 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US8974573B2 (en) 2004-08-11 2015-03-10 Emerson Climate Technologies, Inc. Method and apparatus for monitoring a refrigeration-cycle system
US20060036349A1 (en) * 2004-08-11 2006-02-16 Lawrence Kates Method and apparatus for load reduction in an electric power system
US9690307B2 (en) 2004-08-11 2017-06-27 Emerson Climate Technologies, Inc. Method and apparatus for monitoring refrigeration-cycle systems
US20090187281A1 (en) * 2004-08-11 2009-07-23 Lawrence Kates Method and apparatus for monitoring a calibrated condenser unit in a refrigerant-cycle system
US20060032245A1 (en) * 2004-08-11 2006-02-16 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US8034170B2 (en) 2004-08-11 2011-10-11 Lawrence Kates Air filter monitoring system
US20060032379A1 (en) * 2004-08-11 2006-02-16 Lawrence Kates Air filter monitoring system
US9304521B2 (en) * 2004-08-11 2016-04-05 Emerson Climate Technologies, Inc. Air filter monitoring system
US20060051474A1 (en) * 2004-09-08 2006-03-09 Norman Burr Furlong Protein-enriched nut butter compositions and methods for preparing same
US7494536B2 (en) * 2005-01-04 2009-02-24 Carrier Corporation Method for detecting a fault in an HVAC system
US20060144232A1 (en) * 2005-01-04 2006-07-06 Carrier Corporation Method for detecting a fault in an HVAC system
US20090071392A1 (en) * 2005-01-21 2009-03-19 Engineered Products Company Fluid flow restriction indicator
US7470360B2 (en) 2005-01-21 2008-12-30 Engineered Products Company Fluid flow restriction indicator
US20060163127A1 (en) * 2005-01-21 2006-07-27 Engineered Products Co. Fluid flow restriction indicator
US7887624B2 (en) * 2005-10-11 2011-02-15 Black & Decker Inc. Gas concrete saw filtration system
US20070079589A1 (en) * 2005-10-11 2007-04-12 Black & Decker Inc. Gas concrete saw filtration system
US7921720B2 (en) 2006-06-16 2011-04-12 Engineered Products Company Dial-type flow-restriction gauges
US7562579B2 (en) 2006-06-16 2009-07-21 Engineered Products Company Dial-type flow-restriction gauges
US20080072687A1 (en) * 2006-06-16 2008-03-27 Engineered Products Company Dial-type flow-restriction gauges
US20090199645A1 (en) * 2006-06-16 2009-08-13 Engineered Products Company Dial-type flow-restriction gauges
US9885507B2 (en) 2006-07-19 2018-02-06 Emerson Climate Technologies, Inc. Protection and diagnostic module for a refrigeration system
US9823632B2 (en) 2006-09-07 2017-11-21 Emerson Climate Technologies, Inc. Compressor data module
US9310094B2 (en) 2007-07-30 2016-04-12 Emerson Climate Technologies, Inc. Portable method and apparatus for monitoring refrigerant-cycle systems
US10352602B2 (en) 2007-07-30 2019-07-16 Emerson Climate Technologies, Inc. Portable method and apparatus for monitoring refrigerant-cycle systems
US9140728B2 (en) 2007-11-02 2015-09-22 Emerson Climate Technologies, Inc. Compressor sensor module
US9194894B2 (en) 2007-11-02 2015-11-24 Emerson Climate Technologies, Inc. Compressor sensor module
US10458404B2 (en) 2007-11-02 2019-10-29 Emerson Climate Technologies, Inc. Compressor sensor module
US20090120298A1 (en) * 2007-11-11 2009-05-14 Chieh-Yuan Cheng Air filter having function of indicating choked conditions
US20110112814A1 (en) * 2009-11-11 2011-05-12 Emerson Retail Services, Inc. Refrigerant leak detection system and method
US9703287B2 (en) 2011-02-28 2017-07-11 Emerson Electric Co. Remote HVAC monitoring and diagnosis
US10884403B2 (en) 2011-02-28 2021-01-05 Emerson Electric Co. Remote HVAC monitoring and diagnosis
US10234854B2 (en) 2011-02-28 2019-03-19 Emerson Electric Co. Remote HVAC monitoring and diagnosis
US9285802B2 (en) 2011-02-28 2016-03-15 Emerson Electric Co. Residential solutions HVAC monitoring and diagnosis
US9590413B2 (en) 2012-01-11 2017-03-07 Emerson Climate Technologies, Inc. System and method for compressor motor protection
US9876346B2 (en) 2012-01-11 2018-01-23 Emerson Climate Technologies, Inc. System and method for compressor motor protection
US8964338B2 (en) 2012-01-11 2015-02-24 Emerson Climate Technologies, Inc. System and method for compressor motor protection
US9762168B2 (en) 2012-09-25 2017-09-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
US9310439B2 (en) 2012-09-25 2016-04-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
US10488090B2 (en) 2013-03-15 2019-11-26 Emerson Climate Technologies, Inc. System for refrigerant charge verification
US10274945B2 (en) 2013-03-15 2019-04-30 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9638436B2 (en) 2013-03-15 2017-05-02 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9551504B2 (en) 2013-03-15 2017-01-24 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US10775084B2 (en) 2013-03-15 2020-09-15 Emerson Climate Technologies, Inc. System for refrigerant charge verification
US9803902B2 (en) 2013-03-15 2017-10-31 Emerson Climate Technologies, Inc. System for refrigerant charge verification using two condenser coil temperatures
US9765979B2 (en) 2013-04-05 2017-09-19 Emerson Climate Technologies, Inc. Heat-pump system with refrigerant charge diagnostics
US10443863B2 (en) 2013-04-05 2019-10-15 Emerson Climate Technologies, Inc. Method of monitoring charge condition of heat pump system
US10060636B2 (en) 2013-04-05 2018-08-28 Emerson Climate Technologies, Inc. Heat pump system with refrigerant charge diagnostics
US9833734B2 (en) 2013-12-17 2017-12-05 3M Innovative Properties Company Air quality indicator
US10286349B2 (en) 2015-11-10 2019-05-14 3M Innovative Properties Company Air filter use indicators
DE102017210270A1 (en) * 2017-06-20 2018-12-20 Mahle International Gmbh Air filter element with integrated contamination measurement
USD950698S1 (en) 2019-09-09 2022-05-03 Cleanair.Ai Corporation Filter assembly

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