Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7755720 | Electro-optical filter | Dmitri Yu Stephanov | 2010-07-13 |
| 5953082 | Electro-optical active masking filter using see through liquid crystal driven by voltage divider photosensor | — | 1999-09-14 |