Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866541 | Erasing of information signal from an optical disk | Shinobu Kawamura | 1989-09-12 |
| 4863510 | Reduction process for preparing copper, silver, and admixed silver-palladium metal particles | Hiroshi Tamemasa, Hiroshi Makino | 1989-09-05 |
| 4864423 | Information recording disc and information signal recording apparatus therefor | Hirohisa Yamaguchi, Akira Mashimo | 1989-09-05 |
| 4803677 | Rotary recording medium having a guide track and recording and reproducing apparatus therefor | Hirohisa Yamaguchi, Horoshi Usami, Akira Mashimo | 1989-02-07 |
| 4802159 | Information recording disc and information signal recording apparatus therefor | Hirohisa Yamaguchi, Akira Mashimo | 1989-01-31 |
| 4797870 | Optical recording and reproducing apparatus | Kenichi Sato | 1989-01-10 |