Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4304850 | Photographic element for color diffusion transfer process | Mikio Koyama, Satoru Ikeuchi, Noboru Mizukura | 1981-12-08 |
| 4234671 | Color diffusion transfer dye mordant | Mikio Koyama, Masao Asano, Yasuo Tsuda | 1980-11-18 |
| 4193800 | Photographic dye mordant | Mikio Koyama, Yasuo Tsuda, Masao Asano | 1980-03-18 |