Citada por|
| 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 | | US4411023 | 13 Oct 1981 | 25 Oct 1983 | | Smoke protective hood | | US4981134 | 16 Ene 1990 | 1 Ene 1991 | | Filtering face mask with inhalation/exhalation check valves | | US5140980 | 13 Jun 1990 | 25 Ago 1992 | ILC Dover, Inc. | Hood mask and air filter system and method of manufacture thereof | | US6543450 | 12 Feb 2001 | 8 Abr 2003 | | Survival mask |
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