|
| US4064876 | 30 Ene 1976 | 27 Dic 1977 | Stanley I. Wolf | Air-pollution filter and face mask |
| US4141703 | 4 Mar 1977 | 27 Feb 1979 | Stanley I. Wolf | Air-pollution filter and face mask |
| US4233972 | 8 May 1978 | 18 Nov 1980 | | Portable air filtering and breathing assist device |
| US4414973 | 10 Mar 1981 | 15 Nov 1983 | U.S.D. Corp. | Respirator face mask |
| US4543112 | 30 Abr 1984 | 24 Sep 1985 | Figgie International Inc. | Sorbent type filter assembly for a respirator and method of making same |
| US4548626 | 30 Abr 1984 | 22 Oct 1985 | Figgie International Inc. | Particulate air filter assembly |
| US4579113 | 23 Abr 1984 | 1 Abr 1986 | Parmelee Industries, Inc. | Disposable covers for respirators |
| US4787925 | 15 Abr 1983 | 29 Nov 1988 | Figgie International Inc. | Gas filter canister housing assembly |
| US4850346 | 20 Oct 1986 | 25 Jul 1989 | WGM Safety Corp. | Respirator |
| US4921512 | 30 Mar 1989 | 1 May 1990 | American Optical Corporation | Filter element |
| US4934361 | 17 Feb 1989 | 19 Jun 1990 | WGM Safety Corp. | Respirator |
| US4981134 | 16 Ene 1990 | 1 Ene 1991 | | Filtering face mask with inhalation/exhalation check valves |
| US5036844 | 19 Jun 1990 | 6 Ago 1991 | Mine Safety Appliances Company | Cover assembly and pre-filter for a respirator |
| US5222488 | 11 Jul 1991 | 29 Jun 1993 | Donaldson Company, Inc. | Respirator air filter cartridge with a replaceable filter element |
| US5647356 | 28 Jul 1993 | 15 Jul 1997 | Donaldson Company, Inc. | Respirator cartridge with sealing fit test structure and method of use |
| US5766287 | 9 Abr 1997 | 16 Jun 1998 | Monsanto Company | Respiratory filter and sampling device |
| US5886032 | 27 Ene 1998 | 23 Mar 1999 | Redox Pharmaceutical Corporation | Method of treating cyanide poisoning |
| US6277178 | 20 Ene 1995 | 21 Ago 2001 | 3M Innovative Properties Company | Respirator and filter cartridge |
| US6363934 | 3 Sep 1998 | 2 Abr 2002 | Parmalee Industries, Inc. | Respirator filter protective cover |
| US6584976 | 24 Jul 1998 | 1 Jul 2003 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
| US6701925 | 11 Abr 2002 | 9 Mar 2004 | | Protective hood respirator |
| US6761169 | 17 Ago 2001 | 13 Jul 2004 | Vase Technology | Bi/multi-directional filter cartridge and filter platform for mounting the cartridge thereon |
| US6793702 | 28 Jun 2001 | 21 Sep 2004 | | Filter cartridge platform and filter cartridge for use on the platform |
| US6805124 | 12 Ago 2002 | 19 Oct 2004 | 3M Innovative Properties Company | Face mask that has a filtered exhalation valve |
| US7559323 | 9 Nov 2005 | 14 Jul 2009 | Respan Products, Inc. | Disposable mask assembly with exhaust filter |
| USD271246 | 2 Mar 1981 | 1 Nov 1983 | U.S.D. Corp. | Combined respirator face piece and strap units |