Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830944 | Function separated photosensitive member having a diphenylamine derivative disazo charge generation material | Shoji Umehara, Masakazu Matsumoto, Shozo Ishikawa | 1989-05-16 |
| 4810607 | Photosensitive member for electrophotography containing trisazo pigment having pyridylene group in its central skeleton | Masakazu Matsumoto, Hideyuki Takai | 1989-03-07 |
| 4798777 | Electrophotographic member containing vinylene benzocarazole as charge transporting material | Masakazu Matsumoto, Toshihiro Kikuchi | 1989-01-17 |