Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874973 | Method and arrangement for securing a pulley to a rotor in an electromagnetic clutch | Genzo Yanai | 1989-10-17 |
| 4871243 | Photographic lens of improved near distance performance | Hideki Ogawa | 1989-10-03 |
| 4865434 | Zoom lens capable of selecting a focal length beyond a standard focal length range | Sadatoshi Takahashi, Nozomu Kitagishi, Keiji Ikemori, Tsunefumi Tanaka | 1989-09-12 |
| 4830477 | Zoom lens capable of obtaining focal lengths beyond a variable focal length range | Sadatoshi Takahashi, Keiji Ikemori, Nozomu Kitagishi, Tsunefumi Tanaka, Kikuo Momiyama | 1989-05-16 |
| 4828090 | Electromagnetic clutch | — | 1989-05-09 |
| 4807983 | Photographic lens of extended focusing range with improved stability of picture quality | — | 1989-02-28 |
| 4799578 | Apparatus for preventing heat damage in an electromagnetic clutch | — | 1989-01-24 |