Issued Patents 1989
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871238 | Photographic optical device with variable magnification | Yasuhisa Sato, Hiroki Nakayama, Kouji Oizumi | 1989-10-03 |
| 4868060 | Magnetic recording medium | Katsumi Ryoke, Toshimitu Okutu, Masatoshi Takahashi | 1989-09-19 |
| 4862202 | Magnification change-over device for camera | Takayuki Tsuboi, Isao Nakazawa, Yoshihiro Harunari, Yasuhisa Sato | 1989-08-29 |
| 4842395 | Finder of variable magnification | Yasuhisa Sato, Nozomu Kitagishi, Hiroki Nakayama, Kouji Oizumi | 1989-06-27 |
| 4842781 | Colored polarizing film and method of making same | Tsutomu Nishizawa, Junichi Fujio, Shin Hosonuma | 1989-06-27 |
| 4840466 | Changeable magnification optical system | Isao Nakazawa | 1989-06-20 |
| 4840842 | Abrasive tape | Nobutaka Yamaguchi, Masaaki Fujiyama, Masami Suzuki | 1989-06-20 |
| 4837081 | Magnetic recording medium | Hajime Miyatsuka, Tsutomu Okita, Nobuo Tsuji | 1989-06-06 |
| 4830474 | Variable magnification optical system | Hiroki Nakayama, Yasuhisa Sato, Kouji Oizumi | 1989-05-16 |
| 4815830 | Small sized zoom lens | Yasuhisa Sato, Hiroki Nakayama | 1989-03-28 |
| 4812369 | Magnetic recording medium | Kazuko Hanai, Takahito Miyoshi | 1989-03-14 |
| 4808507 | Electrophotographic photoreceptor 2-Phenyl-benzooxazole bisazo based | Hisato Itoh, Tsutomu Nishizawa, Akihiro Yamaguchi | 1989-02-28 |
| 4808503 | Electrophotographic receptors with charge generating azo-substituted tetraphenyl-thiophene or thiophene 1,1-dioxide | Hisato Itoh, Tsutomu Nishizawa, Akihiro Yamaguchi | 1989-02-28 |
| 4798755 | Magnetic recording medium | Hajime Miyatsuka | 1989-01-17 |