Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877724 | Method and composition for hardening gelatin | Chung-Yuan Chen, Edgar E. Riecke, Derek D. Chapman | 1989-10-31 |
| 4859539 | Optically brightened polyolefin coated paper support | Donna L. Tomko | 1989-08-22 |