Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857446 | Filter dye for photographic element | Donald R. Diehl | 1989-08-15 |
| 4855221 | Photographic elements having oxonol dyes | Donald R. Diehl | 1989-08-08 |
| 4803150 | Radiographic element exhibiting reduced crossover | Robert E. Dickerson, James E. Kelly, Donald R. Diehl | 1989-02-07 |