Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873678 | Optical head and optical information processor using the same | Sadatsugi Machida, Tsuyoshi Toda | 1989-10-10 |
| 4855991 | Optical disk having track offset detection areas | Toshimitsu Kaku, Yoshito Tsunoda, Takeshi Maeda | 1989-08-08 |
| 4839257 | Color diffusion transfer photographic film unit | Minoru Minoda, Keisuke Shiba | 1989-06-13 |
| 4835756 | Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor | Toshimitsu Kaku, Takeshi Maeda, Masaru Ito, Kazuo Shigematsu, Yoshito Tsunoda | 1989-05-30 |
| 4815058 | Optical information processing apparatus | Yoshito Tsunoda | 1989-03-21 |
| 4807923 | Window seal construction for sashless door | — | 1989-02-28 |