Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871238 | Photographic optical device with variable magnification | Yasuyuki Yamada, Hiroki Nakayama, Kouji Oizumi | 1989-10-03 |
| 4862202 | Magnification change-over device for camera | Takayuki Tsuboi, Isao Nakazawa, Yoshihiro Harunari, Yasuyuki Yamada | 1989-08-29 |
| 4842395 | Finder of variable magnification | Nozomu Kitagishi, Yasuyuki Yamada, Hiroki Nakayama, Kouji Oizumi | 1989-06-27 |
| 4830474 | Variable magnification optical system | Hiroki Nakayama, Kouji Oizumi, Yasuyuki Yamada | 1989-05-16 |
| 4815830 | Small sized zoom lens | Yasuyuki Yamada, Hiroki Nakayama | 1989-03-28 |