|
| US4309774 | 2 Sep 1980 | 12 Ene 1982 | | Ventilating helmet |
| US4498202 | 24 Feb 1983 | 12 Feb 1985 | Yamamoto Kogaku Co., Ltd. | Helmet equipped with ventilator |
| US4672968 | 30 Ago 1985 | 16 Jun 1987 | | Headwear with built-in cooling means |
| US4743173 | 8 May 1985 | 10 May 1988 | Papst-Motoren GmbH & Co. KG | Slide beating unit for small size fan |
| US4801252 | 28 Dic 1987 | 31 Ene 1989 | Papst-Motoren GmbH & Co. KG | Slide bearing unit for small size fan |
| US5029342 | 25 Oct 1989 | 9 Jul 1991 | | Welder's helmet and photovoltaic power transmission circuit therefor |
| US5031237 | 5 Dic 1989 | 16 Jul 1991 | | Light actuated air recirculating and filtration system |
| US5404874 | 8 Mar 1993 | 11 Abr 1995 | Micronel AG | Device for connecting a fan to a face mask filter |
| US5499624 | 21 Oct 1993 | 19 Mar 1996 | Dragerwerk AG | Breathing mask with face-contact actuated overpressure generating switch |
| US5555879 | 15 Nov 1994 | 17 Sep 1996 | | Safety mask |
| US5575622 | 16 Dic 1994 | 19 Nov 1996 | Staco, Inc. | Method and apparatus for mounting a fan guard |
| US6035451 | 10 Mar 1998 | 14 Mar 2000 | Minnesota Mining and Manufacturing Company | Protective helmet system with cam for attaching first and second face shields thereto |
| US6050262 | 8 Jul 1998 | 18 Abr 2000 | Giat Industries | Overpressure ventilation device for a gas mask |
| US6382208 | 2 Nov 1998 | 7 May 2002 | Board of Regents University of Nebraska | System for controlling the internal temperature of a respirator |
