Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5422382 | Substituted xanthene compounds | Kenneth S. Norland, F. Donald Roberts, Charles M. Zepp | 1995-06-06 |
| 5326502 | Pyridylbenzimidazole compositions for absorbing ultraviolet light | George Richard Bird, Kenneth S. Norland, Louis M. Scarmoutzos | 1994-07-05 |
| 5149830 | Substituted xanthene compounds | Kenneth S. Norland, F. Donald Roberts, Charles M. Zepp | 1992-09-22 |
| 4619784 | Image dye-providing materials | Charles M. Zepp, Ronald F. Cieciuch | 1986-10-28 |
| 4452878 | Quaternary nitrogen-containing polymers and articles including same | Charles M. Zepp | 1984-06-05 |
| 4405788 | Bicyclo nitrogenheterocyclic substituted sulfofluoresceins, fluoresceins and xanthenes | Charles M. Zepp, Ronald F. Cieciuch | 1983-09-20 |
| 4386216 | Magenta dye developers | Howard G. Rogers, Ruth C. Bilofsky, Ronald F. Cieciuch, Charles M. Zepp | 1983-05-31 |
| 4310673 | Xanthene compounds | James W. Foley, Charles M. Zepp | 1982-01-12 |
| 4290951 | 3,6-Di(N-indolinyl)-9-sulfonamidophenyl-xanthenes | James W. Foley, Charles M. Zepp | 1981-09-22 |
| 4267251 | Novel image dye-providing materials, photographic products and processes | Charles M. Zepp, Ronald F. Cieciuch | 1981-05-12 |
| 4264701 | Magenta dye developers | Howard G. Rogers, Ruth C. Bilofsky, Ronald F. Cieciuch, Charles M. Zepp | 1981-04-28 |
| 4258118 | Novel xanthene compounds and photographic products and processes employing the same | James W. Foley, Charles M. Zepp | 1981-03-24 |