Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4943518 | Direct-positive silver halide photographic light-sensitive material and method of processing it | Tomomi Yoshizawa, Keiji Ogi, Yasuo Tosaka, Yoshiyuki Nonaka | 1990-07-24 |
| 4939078 | Direct positive-type silver halide light-sensitive photographic material | Bunzo Ueda, Yasuo Tosaka | 1990-07-03 |