|
| US4974586 | 6 Oct 1988 | 4 Dic 1990 | Moldex/Metric Products, Inc. | Breathing mask |
| US6701925 | 11 Abr 2002 | 9 Mar 2004 | | Protective hood respirator |
| US6959709 | 31 May 2001 | 1 Nov 2005 | 3M Innovative Properties Company | Manner of attaching component elements to filtration material such as may be utilized in respiratory masks |
| US7004162 | 30 Sep 1999 | 28 Feb 2006 | Canadian Monaghan, Ltd. | Exhalation valve |
| US7007695 | 10 Jun 2003 | 7 Mar 2006 | 3M Innovative Properties Company | Manner of attaching component elements to filtration material such as may be utilized in respiratory masks |
| US7013896 | 6 May 2002 | 21 Mar 2006 | Trudell Medical International | Mask with inhalation valve |
| US7069931 | 20 Jul 2005 | 4 Jul 2006 | 3M Innovative Properties Company | Method of making a filtering face mask that has an exhalation valve attached thereto |
