Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883733 | Electrophotographic printing process using photochromic compound | Hiroshi Sugimura, Yoshimi Kojima, Shuhei Tsuchimoto | 1989-11-28 |
| 4853309 | Photoreceptor for electrophotography with a-Si layers having a gradient concentration of doped atoms and sandwiching the photoconductive layer therebetween | Takashi Hayakawa, Hideo Nojima, Yoshimi Kojima, Shiro Narikawa, Toshiro Matsuyama +1 more | 1989-08-01 |