Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5155719 | Optical information recording and/or reproducing apparatus | — | 1992-10-13 |
| 5028774 | Method and apparatus for detecting and measuring the refractive index of an optical disc substrate | Akihiko Yoshizawa | 1991-07-02 |
| 4926402 | Method of recording bivalent signals on opto-magnetic record medium | — | 1990-05-15 |
| 4444807 | Method for treating a surface of a polyester film | — | 1984-04-24 |