Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857440 | Photographic material and process (B) | William J. Begley, John M. Buchanan | 1989-08-15 |
| 4847185 | Photographic material and process (A) | William J. Begley, John M. Buchanan | 1989-07-11 |