Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859576 | Silver halide photographic material comprising a protective layer containing a polyoxyethylene surface active agent | Nobuaki Miyasaka, Shigeki Yokoyama, Shuzo Suga, Takashi Naoi | 1989-08-22 |
| 4833063 | Color diffusion transfer element comprising two neutralizing layers and two timing layers | Hideki Tomiyama, Ikutaro Horie | 1989-05-23 |
| 4797353 | Method for developing of silver halide photographic materials utilizing reduced amounts of organic substances | Sumito Yamada, Hiroshi Kawasaki | 1989-01-10 |