William R. Heffner

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Plainfield, NJ, US

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Patents Grantslast 30 patents

Information Patent Grant
Matrix addressed bistable liquid crystal display
- Patent number 4,529,271
- Issue date Jul 16, 1985
- AT&T Bell Laboratories
- Dwight W. Berreman
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Bistable liquid crystal twist cell
- Patent number 4,505,548
- Issue date Mar 19, 1985
- AT&T Bell Laboratories
- Dwight W. Berreman
- G02 - OPTICS
Information Patent Grant
Bistable liquid crystal twist cell
- Patent number 4,239,345
- Issue date Dec 16, 1980
- Bell Telephone Laboratories, Incorporated
- Dwight W. Berreman
- G02 - OPTICS