Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871238 | Photographic optical device with variable magnification | Yasuhisa Sato, Yasuyuki Yamada, Kouji Oizumi | 1989-10-03 |
| 4842386 | Variable focal length objective | Nozomu Kitagishi, Shigeyuki Suda, Jun Hattori, Akihisa Horiuchi | 1989-06-27 |
| 4842395 | Finder of variable magnification | Yasuhisa Sato, Nozomu Kitagishi, Yasuyuki Yamada, Kouji Oizumi | 1989-06-27 |
| 4830474 | Variable magnification optical system | Yasuhisa Sato, Kouji Oizumi, Yasuyuki Yamada | 1989-05-16 |
| 4815830 | Small sized zoom lens | Yasuhisa Sato, Yasuyuki Yamada | 1989-03-28 |
| 4810070 | Lens system having a good image performance for white light | Shigeyuki Suda, Jun Hattori, Nozomu Kitagishi, Akihisa Horiuchi | 1989-03-07 |