Inventor
FRIEDER JR LEONARD P
US8 patents
Patents
8 patentsUS4345338AAug 24, 1982
Custom-fitted helmet and method of making same
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US4023209AMay 17, 1977
Protective helmet assembly with segmental outer shell
GENTEX CORP123 citations96
US4374301AFeb 15, 1983
Local external communication device for enclosed helmet and mask assembly
GENTEX CORP56 citations95
US4087653AMay 2, 1978
Sound attenuating earcup assembly provided with receivers and contact microphone
GENTEX CORP41 citations92
US3994023ANov 30, 1976
Simplified protective helmet assembly
GENTEX CORP49 citations92
US6752893B2Jun 22, 2004
Rimless spectacles and method for making the same
GENTEX CORP34 citations91
US4132861AJan 2, 1979
Headset having double-coil earphone
GENTEX CORP34 citations86
US11089832B2Aug 17, 2021
Helmet impact attenuation article
GENTEX CORP7 citations81