Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4990625 | Process for synthesis of N,N-disubstituted hydrazone | Tetsuo Arita, Shoji Umehara, Kiyoshi Sakai | 1991-02-05 |
| 4888261 | Electrophotographic photsensitive member | — | 1989-12-19 |
| 4717636 | Electrophotographic photosensitive member containing polyvinylarylal | Hideyuki Takahashi, Masataka Yamashita, Masakazu Matsumoto | 1988-01-05 |
| 4554231 | Electrophotographic photosensitive member | Shozo Ishikawa, Kiyoshi Sakai, Katsunori Watanabe, Makoto Kitahara | 1985-11-19 |
| 4501808 | Recording medium and process employing a photosensitive organic film | Kiyoshi Sakai, Shozo Ishikawa, Tetsuo Arita, Shoji Umehara | 1985-02-26 |
| 4456671 | Electrophotographic photosensitive member having a photosensitive layer containing a hydrazone compound | Naoto Fujimura, Shozo Ishikawa, Yoshio Takasu, Kiyoshi Sakai, Masaki Kuribayashi | 1984-06-26 |
| 4423129 | Electrophotographic member having layer containing methylidenyl hydrazone compound | Yoshio Takasu, Kiyoshi Sakai, Shozo Ishikawa, Katsunori Watanabe | 1983-12-27 |
| 4420548 | Electrophotographic member with hydrazone or ketazine compounds | Kiyoshi Sakai, Toshiko Suzuki, Yuji Egarashi, Shozo Ishikawa | 1983-12-13 |
| 4399207 | Electrophotographic photosensitive member with hydrazone compound | Kiyoshi Sakai, Shozo Ishikawa, Makoto Kitahara | 1983-08-16 |
| 4399208 | Electrophotographic photosensitive member | Yoshio Takasu, Norie Takebayashi, Kiyoshi Sakai, Shozo Ishikawa | 1983-08-16 |
| 4391889 | Electrophotographic photosensitive member with benzimidazole ring containing hydrazones | Kiyoshi Sakai, Shozo Ishikawa, Yuji Egashira, Makoto Kitahara | 1983-07-05 |