Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830944 | Function separated photosensitive member having a diphenylamine derivative disazo charge generation material | Shoji Umehara, Takao Takiguchi, Shozo Ishikawa | 1989-05-16 |
| 4820602 | Electrophotographic photosenitive member comprising disazo compounds having non-symetric coupler portions | — | 1989-04-11 |
| 4810607 | Photosensitive member for electrophotography containing trisazo pigment having pyridylene group in its central skeleton | Takao Takiguchi, Hideyuki Takai | 1989-03-07 |
| 4798777 | Electrophotographic member containing vinylene benzocarazole as charge transporting material | Takao Takiguchi, Toshihiro Kikuchi | 1989-01-17 |