|
| US4382440 | 18 Mar 1981 | 10 May 1983 | | Smoke and pollutant filtering device |
| US4854314 | 13 Nov 1987 | 8 Aug 1989 | | Safety pillow for preventing smoke inhalation |
| US5549720 | 19 Dec 1994 | 27 Aug 1996 | Nellcor Puritan-Bennett Incorporated | Filter |
| US6340024 | 4 Nov 1994 | 22 Jan 2002 | DME Corporation | Protective hood and oral/nasal mask |
| US6966318 | 17 Aug 2004 | 22 Nov 2005 | Chang Gung University | Filtering mask |
| USD389243 | 19 Dec 1995 | 13 Jan 1998 | Nellcor Puritan Bennett Incorporated | Filter |
