Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882261 | High contrast dot enhancing compositions and photographic products and methods for their use | John F. Pilot, Burton H. Waxman | 1989-11-21 |
| 4871540 | Process for producing a biologically active substance and compositions containing the same | Sadao Tamamura | 1989-10-03 |