Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866029 | Arylidene pyrazolone dye-donor element for thermal dye transfer | Helmut Weber | 1989-09-12 |
| 4853366 | Pyrazolidinedione arylidene dye-donor element for thermal dye transfer | Helmut Weber, Donald R. Diehl | 1989-08-01 |
| 4839336 | Alpha-cyano arylidene pyrazolone magenta dye-donor element for thermal dye transfer | Helmut Weber | 1989-06-13 |