Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4529271 | Matrix addressed bistable liquid crystal display | William R. Heffner, Allan R. Kmetz | 1985-07-16 |
| 4505548 | Bistable liquid crystal twist cell | William R. Heffner | 1985-03-19 |
| 4239345 | Bistable liquid crystal twist cell | William R. Heffner | 1980-12-16 |
| 4190330 | Variable focus liquid crystal lens system | — | 1980-02-26 |