Issued Patents 1989
Showing 1–2 of 2 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, Hideo Nojima, Yoshimi Kojima, Shiro Narikawa, Eiji Imada +1 more | 1989-08-01 |
| 4851256 | Apparatus and method for manufacturing photosensitive amorphous silicon objects | Yoshimi Kojima, Shaw Ehara | 1989-07-25 |