Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5659531 | Optical head device and birefringent diffraction grating polarizer and polarizing hologram element used therein | Akitomo Oba | 1997-08-19 |
| 5636049 | Mechanism for scanning the inner periphery of a drum included in an image forming apparatus | Seiji Kawata | 1997-06-03 |