Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888631 | Semiconductor dynamic memory device | Daisuke Azuma, Yoshiji Ohta | 1989-12-19 |
| 4875202 | Disk-type storage medium recording/reproducing apparatus | Toshikazu Kodo | 1989-10-17 |
| 4862295 | Method of formatting a storage medium and drive unit for controlling the reading and writing of data on the formatted storage medium | Shigeru Matsukawa | 1989-08-29 |
| 4852126 | Digital information reproducing apparatus | Toshikazu Koudo, Tohru Kushisaka | 1989-07-25 |
| 4835505 | Magnetic ring for detecting the rotation of an object | Kenji Hattori, Hiroshi Tanaka | 1989-05-30 |
| 4823334 | Optical head with easily adjustable collimator having two lens components | Hiromichi Ishibashi | 1989-04-18 |