|
| US4662270 | 30 Aug 1985 | 5 May 1987 | Kolpack Industries Inc. | Door jamb post and valved vent passage with heater |
| US5325892 | 25 Nov 1992 | 5 Jul 1994 | Minnesota Mining and Manufacturing Company | Unidirectional fluid valve |
| US5509436 | 23 May 1995 | 23 Apr 1996 | Minnesota Mining and Manufacturing Company | Unidirectional fluid valve |
| US5687767 | 26 Jul 1996 | 18 Nov 1997 | Racal Health & Safety Limited | Uni-directional fluid valve |
| US6116866 | 23 Jan 1998 | 12 Sep 2000 | Kasei Optonix, Ltd. | Reed valve for a pump |
| US6357473 | 25 May 2000 | 19 Mar 2002 | Ligon Brother Manufacturing Company | One way anti-backflow valve |
| US6837265 | 18 Mar 2002 | 4 Jan 2005 | Ligon Brothers Manufacturing Co. | One way anti-back flow valve |
| US6843248 | 18 Apr 2001 | 18 Jan 2005 | 3M Innovative Properties Company | Filtering face mask that has a new exhalation valve |
| US6854463 | 11 May 1994 | 15 Feb 2005 | 3M Innovative Properties Company | Filtering face mask that has a new exhalation valve |
| US7311104 | 18 Apr 2001 | 25 Dec 2007 | 3M Innovative Properties Company | Method of making a filtering face mask that has an exhalation valve |
| US7428903 | 6 Oct 2000 | 30 Sep 2008 | 3M Innovative Properties Company | Fibrous filtration face mask having a new unidirectional fluid valve |
| US7493900 | 3 Oct 2000 | 24 Feb 2009 | 3M Innovative Properties Company | Fibrous filtration face mask having a new unidirectional fluid valve |
| US7814879 | 23 Apr 2008 | 19 Oct 2010 | Techtronic Outdoor Products Technology Limited | Monolithic block and valve train for a four-stroke engine |
| USRE37974 | 15 Nov 1999 | 4 Feb 2003 | 3M Innovative Properties Company | Uni-directional fluid valve |
| USRE43289 | 8 Nov 2001 | 3 Apr 2012 | 3M Innovative Properties Company | Uni-directional fluid valve |
