Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491391 | System, apparatus, and method for reducing birefringence | Ronald D. Blum, Youval Katzman, Israel Grossinger, Uzi Efron, Dan Katzman | 2002-12-10 |
| 6491394 | Method for refracting and dispensing electro-active spectacles | Ronald D. Blum, Dan Katzman | 2002-12-10 |