Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4326021 | Photographic negative material with at least one layer containing a desensitized silver halide emulsion | Rolf Steiger | 1982-04-20 |
| 4311786 | Novel sensitizers and their use in direct-positive photographic materials | Rolf Steiger | 1982-01-19 |