Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865434 | Zoom lens capable of selecting a focal length beyond a standard focal length range | Takashi Matsushita, Nozomu Kitagishi, Keiji Ikemori, Tsunefumi Tanaka | 1989-09-12 |
| 4852984 | Telephoto lens of large aperture ratio | Hideki Ogawa, Hiroshi Endo | 1989-08-01 |
| 4830477 | Zoom lens capable of obtaining focal lengths beyond a variable focal length range | Keiji Ikemori, Nozomu Kitagishi, Tsunefumi Tanaka, Takashi Matsushita, Kikuo Momiyama | 1989-05-16 |
| 4810072 | Zoom lens | — | 1989-03-07 |