Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873173 | Method of forming image providing a change in sensitivity by altering the pH of the developer | Senzo Sasaoka, Nobuaki Inoue | 1989-10-10 |
| 4857445 | Direct positive photo-sensitive materials | Tatsuo Heki | 1989-08-15 |