Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885366 | Novel selenium-containing merocyanine dyes | Frederick J. Sauter | 1989-12-05 |
| 4874866 | Photographically useful chalcogenazoles, chalcogenazolines, and chalcogenazolinium and chalcogenazolium salts | Ronald E. Leone, Rosemary Przyklek | 1989-10-17 |
| 4861703 | Cyclic dichalcogenide fog inhibiting agents for silver halide photography | Roger Lok, John P. Freeman | 1989-08-29 |
| 4831136 | Oxatellurazolium and oxatellurazinium compounds | Ronald E. Leone, Rosemary Przyklek | 1989-05-16 |