Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5683859 | Photographic developing composition containing a sludge inhibiting agent and use thereof in the high contrast development of nucleated photographic elements | Ronald J. Nothnagle, Jeffrey Richard Sefl | 1997-11-04 |
| 5232818 | Nucleated high contrast photographic elements containing thioether compounds to inhibit pepper fog and restrain image spread | Donald L. Kerr | 1993-08-03 |
| 5196292 | Nucleated high contrast photographic elements containing ballasted thioether isothioureas to inhibit pepper fog and restrain image spread | Donald L. Kerr | 1993-03-23 |
| 5126227 | High contrast photographic elements containing ballasted hydrophobic isothioureas | Donald L. Kerr | 1992-06-30 |
| 5041355 | High contrast photographic element including an aryl sulfonamidophenyl hydrazide containing ethyleneoxy groups | Donald L. Kerr | 1991-08-20 |
| 4988604 | High contrast photographic element including an aryl sulfonamidophenyl hydrazide containing both thio and ethyleneoxy groups | Donald L. Kerr | 1991-01-29 |
| 4975354 | Photographic element comprising an ethyleneoxy-substituted amino compound and process adapted to provide high constrast development | Donald L. Kerr | 1990-12-04 |
| 4912016 | High contrast photographic recording material and emulsion and process for their development | Lee J. Fleckenstein, Donald L. Kerr | 1990-03-27 |
| 4804620 | Photographic material containing a novel polymeric dye-forming coupler | Ping-Wah Tang, Philip T. S. Lau, Stanley W. Cowan, Tien-Teh Chen | 1989-02-14 |