Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881926 | Stepless speed variator of a belt type | Hachiro Aoki, Junya Kuronuma, Hideya Kikuchi | 1989-11-21 |
| 4871614 | Opto-magnetic recording medium having three exchange-coupled magnetic layers | — | 1989-10-03 |
| 4859763 | Preparation process of dl-lactic acid-glycolic acid-copolymer | Hiroshi Takayanagi, Takayoshi Masuda, Hosei Shinoda | 1989-08-22 |
| 4860274 | Information storage medium and method of erasing information | — | 1989-08-22 |
| 4842956 | Opto-magnetic recording medium having three exchange-coupled magnetic layers | — | 1989-06-27 |
| 4839509 | Connector device for connecting IC card to reading and/or writing apparatus | Jun-ichi Yasuma, Masakuni Ishikawa | 1989-06-13 |
| 4803660 | Optical recording medium | Katsumi Suzuki, Naomasa Nakamura | 1989-02-07 |