Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5065380 | Diffraction grating for an optical pickup device | — | 1991-11-12 |
| 5049733 | Semiconductor chip detecting device for providing focusing and reproduction signals | Koji Yoshifusa, Hikaru Nishihara | 1991-09-17 |
| 5007713 | Beam converting apparatus with a parallel light beam input and output from one prism plane | Koji Yoshifusa | 1991-04-16 |
| 4998806 | Image reading apparatus | Shigeki Tsuji, Yukio Kurata | 1991-03-12 |
| 4983017 | Optical head device for reading information stored in a recording medium | Shigeki Tsuji | 1991-01-08 |