Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4737439 | Photographic compositions and elements including internal latent image silver halide grains and nucleating agents therefor | John P. Freeman, Roy L. Orvis, Richard L. Parton | 1988-04-12 |
| T105001 | Adsorbable alkynyl substituted heterocyclic quaternary ammonium salts and applications thereof to silver halide photography | Richard L. Parton, Wilbur S. Gaugh | 1985-01-01 |
| 4478928 | Application of activated arylhydrazides to silver halide photography | Thomas Hess | 1984-10-23 |
| 4471044 | Silver halide emulsions and photographic elements containing adsorbable alkynyl substituted heterocyclic quaternary ammonium salts | Richard L. Parton, Wilbur S. Gaugh | 1984-09-11 |