Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853309 | Photoreceptor for electrophotography with a-Si layers having a gradient concentration of doped atoms and sandwiching the photoconductive layer therebetween | Takashi Hayakawa, Yoshimi Kojima, Shiro Narikawa, Toshiro Matsuyama, Eiji Imada +1 more | 1989-08-01 |