Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4269916 | Photographic prints utilizing lamellar pigment materials | Ruth C. Bilofsky | 1981-05-26 |
| 4264701 | Magenta dye developers | Louis Locatell, Jr., Ruth C. Bilofsky, Ronald F. Cieciuch, Charles M. Zepp | 1981-04-28 |
| 4216018 | Photographic products and processes employing lamellar pigments | Ruth C. Bilofsky | 1980-08-05 |