|
| US4907584 | 3 Mar 1988 | 13 Mar 1990 | | Respiratory mask |
| US4957106 | 17 Nov 1988 | 18 Sep 1990 | Engicom, Naamloze Vennootschap | Gas mask coupled to monolithic member with speech membrane |
| US5570689 | 1 May 1995 | 5 Nov 1996 | Respironics, Inc. | Respiratory mask having a vertically adjustable spacer element that limits seal deformation on a wearer's face |
| US6701925 | 11 Abr 2002 | 9 Mar 2004 | | Protective hood respirator |
| US7007690 | 31 Ago 2000 | 7 Mar 2006 | The United States of America as represented by the Secretary of the Army | Advanced chemical/biological crew mask |
