Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5340637 | Optical device diffraction gratings and a photomask for use in the same | Makoto Okai, Shinji Tsuji, Motohisa Hirao, Hiroyoshi Matsumura, Tatsuo Harada +2 more | 1994-08-23 |