Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851321 | Superhigh contrast negative-type silver halide photographic material | Yoshihiro Takagi, Hisashi Okada, Morio Yagihara | 1989-07-25 |
| 4839258 | Super-high contrast negative type photographic material containing hydrazine and a reductone | — | 1989-06-13 |
| 4800150 | Super-high contrast negative type photographic material | — | 1989-01-24 |