|
| US4075717 | 22 Ene 1976 | 28 Feb 1978 | | Helmate |
| US4239106 | 11 Ene 1979 | 16 Dic 1980 | Gentex Corporation | Individually fitted helmet and method of and apparatus for making the same |
| US4290149 | 11 Feb 1980 | 22 Sep 1981 | Gentex Corporation | Method of making an individually fitted helmet |
| US4324005 | 18 Ene 1980 | 13 Abr 1982 | Charles S. Willis | Protective headgear |
| US4375108 | 28 Ene 1981 | 1 Mar 1983 | The Regents of the University of Michigan | Energy-absorbing insert for protective headgear |
| US5014365 | 23 Ene 1989 | 14 May 1991 | Maxpro Helmets, Inc. | Gas-fitted protective helmet |
| US5083320 | 24 Dic 1990 | 28 Ene 1992 | Athletic Helmet, Inc. | Protective helmet with self-contained air pump |
| US5129107 | 28 Sep 1990 | 14 Jul 1992 | | Inflatable safety helmet, specially for motorcycling |
| US5175889 | 2 Abr 1992 | 5 Ene 1993 | Riddell, Inc. | Inflatable liner for protective headgear |
| US5181279 | 25 Nov 1991 | 26 Ene 1993 | | Cushioned helmet |
| US5263203 | 2 Mar 1993 | 23 Nov 1993 | Riddell, Inc. | Integrated pump mechanism and inflatable liner for protective |
| US5337420 | 3 Nov 1992 | 16 Ago 1994 | | Method and apparatus for mounting and locating a helmet comfortably on the head of a person, and combination resulting therefrom |
| US5428845 | 31 Mar 1994 | 4 Jul 1995 | Safesport, Inc. | Helmet removal device and method |
| US5566398 | 14 Mar 1995 | 22 Oct 1996 | Safesport, Inc. | Helmet removal device |
| US5720051 | 8 Jul 1996 | 24 Feb 1998 | The United States of America as represented by the Secretary of the Air Force | Inflatable multiple cell helmet liner to enhance fit, security and comfort |
| US5815846 | 27 Nov 1996 | 6 Oct 1998 | Tecno-Fluidos, S.L. | Resistant helmet assembly |
| US5890232 | 25 Nov 1997 | 6 Abr 1999 | | Helmet with an air cushion buffer |
| US6128779 | 14 Nov 1997 | 10 Oct 2000 | Jas D. Easton, Inc. | Limb protector |
| US6178560 | 4 Jun 1999 | 30 Ene 2001 | Southern Impact Research Center, LLC | Helmet fitting system |
| US6367090 | 7 Mar 2001 | 9 Abr 2002 | | Reversible two color protective headgear and blank therefor |
| US6530092 | 9 May 2001 | 11 Mar 2003 | Southern Impact Research Center, LLC | Fitting and comfort system with inflatable liner for helmet |
| US6591428 | 15 Feb 2002 | 15 Jul 2003 | Southern Impact Research Center, LLC | Helmet fitting system |
| US6817039 | 10 Dic 2003 | 16 Nov 2004 | Morning Pride Manufacturing, L.L.C. | Protective helmet, such as firefighter's helmet, with inner pads |
| US6912735 | 28 Jun 2002 | 5 Jul 2005 | Geck Head Gear Limited | Head protection apparatus |
| US7774866 | 5 Oct 2006 | 17 Ago 2010 | Xenith, LLC | Impact energy management method and system |
| US7895681 | 22 Mar 2007 | 1 Mar 2011 | Xenith, LLC | Protective structure and method of making same |
| US7975320 | 20 Dic 2005 | 12 Jul 2011 | Smith Optics, Inc. | Helmet including vent and actuator assembly for moving vent shutter and methods of using same |
| USD335366 | 8 Ene 1991 | 4 May 1993 | Athletic Helmet, Inc. | Helmet |
| USD352333 | 10 Jun 1993 | 8 Nov 1994 | Alvimar Manufacturing Co., Inc. | Inflatable football helmet |
