Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6097451 | Liquid crystal shutter with low twisted nematic liquid crystal cells driven with a low frequency or DC voltage | Stephen Palmer | 2000-08-01 |
| 5825441 | Liquid crystal welding glass shields having improved optical angular properties | Stephen Palmer | 1998-10-20 |
| 4240709 | Multiple layer protective glass, particularly a protective glass for a welding shield | — | 1980-12-23 |