Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877817 | Chlorinated rubber | Tetsuo Tojo, Yasuhiko Otawa, Katsuo Okamoto | 1989-10-31 |
| 4860278 | Optical recording carrier, and recording-reading apparatus, and recording-reading process, employing the same | — | 1989-08-22 |
| 4829168 | Optical memory card | — | 1989-05-09 |
| 4814390 | Chlorinated rubber | Tetsuo Tojo, Yasuhiko Otawa, Katsuo Okamoto | 1989-03-21 |