Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6432595 | Single-layer type electrophotosensitive material and image forming apparatus using the same | Hirofumi Kawaguchi, Yuji Tanaka, Yukikatsu Imanaka | 2002-08-13 |
| 6395439 | Naphthoquinone derivative and electrophotosensitive material using the same | Fumio Sugai | 2002-05-28 |
| 5976742 | Naphthoquinone derivative and electrophotographic material using the naphthoquinone derivative | Fumio Sugai, Kazunari Hamasaki | 1999-11-02 |
| 5977389 | Naphthoquinone derivative | Hideki Okada, Fumio Sugai | 1999-11-02 |
| 5817810 | Tryptanthrine compounds | Fumio Sugai, Syunichi Matsumoto, Yukimasa Watanabe, Hirofumi Kawaguchi, Sakae Saitoh | 1998-10-06 |
| 5773613 | Tryptoanthrinimine derivative and electrophotosensitive material using the same | Hirofumi Kawaguchi, Yukimasa Watanabe, Hiroaki Iwasaki, Yasuyuki Hanatani, Yasufumi Mizuta +7 more | 1998-06-30 |
| 5705694 | Trinitrofluoroenonimine derivative and electrophotosensitive material using the same | Hirofumi Kawaguchi, Yasufumi Mizuta, Syunichi Matsumoto, Toshiyuki Fukami, Ichiro Yamazato +2 more | 1998-01-06 |
| 5616441 | Tryptoanthorine derivative contained in electrophotosensitive material | Hirofumi Kawaguchi, Yasufumi Mizuta, Syunichi Matsumoto, Toshiyuki Fukami, Ichiro Yamazato +2 more | 1997-04-01 |