Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876182 | Photographic elements containing pyrazolone color couplers | — | 1989-10-24 |
| 4853319 | Photographic silver halide element and process | Sundaram Krishnamurthy, Brian H. Johnston, Kenneth N. Kilminster, David C. Vogel | 1989-08-01 |
| 4824771 | Photographic acetanilide couplers with novel ballast group and photographic elements containing them | John D. Goddard | 1989-04-25 |