Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854679 | Photographic system having front conversion lens | — | 1989-08-08 |
| 4854681 | Compact zoom lens | Masatake Kato, Muneharu Sugiura, Kazuo Tanaka | 1989-08-08 |
| 4807982 | Lens system of variable magnification range and having a supplementary lens unit | — | 1989-02-28 |
| 4797700 | Diaphragm device | Hiroyoshi Inaba | 1989-01-10 |