Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889412 | Liquid crystal cell using the electrically controlled birefringence effect and a uniaxial medium of negative optical anisotropy usable therein | Jean-Frederic Clerc, Jean-Claude Deutsch, Sylvie Vey | 1989-12-26 |