1
John D Fergason, Jeffrey K Fergason, Arthur L Berman, James L Fergason: Eye protection device for welding helmets. OSD Envizion Company, Renner Otto Boisselle & Sklar, May 4, 1993: US05208688 (132 worldwide citation)

Light transmission control device includes band pass filter for transmitting light of a wavelength or group of wavelengths and partially blocking transmission of light of a different wavelength or group of wavelengths, and variable optical filter for controllably transmitting light of a wavelength o ...


2
Jeffrey K Fergason, Arthur L Berman, James L Fergason, John D Fergason: Eye protection device for welding helmets which reduces obliquely incident light. OSD Envizion Company, Renner Otto Boisselle & Sklar, May 7, 1996: US05515186 (52 worldwide citation)

A welding helmet and lens therefor includes a shield and a lens including a two identical optical components, each including a polarizer, a further polarizer (analyzer) optically between said optical components and effectively shared as an output device from one optical component and an input device ...


3
Jeffrey K Fergason: Eye protection device for welding helmets and the like with hot mirror and indium tin oxide layer. Renner Otto Boisselle & Sklar, May 21, 1996: US05519522 (32 worldwide citation)

A welding helmet including an optical protective lens including one or more liquid crystal cells as a variable optical transmission device responsive to a prescribed input to vary light transmission and light blocking characteristics thereof, and a hot mirror band pass filter having a relatively wid ...


4
Fergason John D, Fergason Jeffrey K, Berman Arthur L, Fergason James L: Eye protection device for welding helmets and the like.. Osd Envision Co, January 27, 1993: EP0524303-A1

A welding helmet includes a shield (2) and a lens (5) which has both a rapid driven to dark state during which eye (10) protection is provided during welding, a clear state during which maximum clarity is provided for viewing through the lens (5) when welding is not occurring, and a fail state that ...


5
Fergason John D, Fergason Jeffrey K, Berman Arthur L, Fergason James L: Eye protection device for welding helmets and the like. Osd Envizion Company, Fergason John D, Fergason Jeffrey K, Berman Arthur L, Fergason James L, SKLAR Warren A, August 20, 1992: WO/1992/014183

A welding helmet includes a shield (2) and a lens (5) which has both a rapid driven to dark state during which eye (10) protection is provided during welding, a clear state during which maximum clarity is provided for viewing through the lens (5) when welding is not occurring, and a fail state that ...


6
Fergason Jeffrey K, Berman Arthur L, Fergason James L, Fergason John D: Eye protection device for welding helmets and the like. Osd Envizion Company, CAMPBELL Jay R, July 8, 1993: WO/1993/013449

A welding helmet (60) includes a shield (62) and a lens (68) including a first polarizer (14') and a first analyzer (16') in optical series having transmissive axes oriented substantially operationally orthogonal to one another; and, a second polarizer (14'') and a second analyzer (16'') in optical ...