Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4238561 | Image reproduction process using a negative tonable photohardenable element | Helmut G. Sandner | 1980-12-09 |
| 4203770 | Negative tonable photohardenable element | Helmut G. Sandner | 1980-05-20 |