|
| US4221327 | 26 Dec 1978 | 9 Sep 1980 | Tamura Electric Works, Ltd. | Miniature counter having zero reset push buttons |
| US5409666 | 14 Oct 1993 | 25 Apr 1995 | Minnesota Mining and Manufacturing Company | Sensors and methods for sensing |
| US5498549 | 18 Jan 1995 | 12 Mar 1996 | Minnesota Mining and Manufacturing Company | Sensors and methods for sensing |
| US5636653 | 1 Dec 1995 | 10 Jun 1997 | Perception Incorporated | Fluid metering apparatus and method |
| US5902927 | 6 Apr 1998 | 11 May 1999 | Perception Incorporated | Fluid metering apparatus and method |
| US6076542 | 13 Jul 1999 | 20 Jun 2000 | Perception Incorporated | Fluid metering method |
| US6202679 | 15 Apr 1999 | 20 Mar 2001 | Perception Incorporated | Fluid metering apparatus |
| US6460565 | 13 Jul 1999 | 8 Oct 2002 | Perception Incorporated | Fluid metering apparatus and method |