Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849306 | Dry toners containing methinefanal pigments | Roderich Raue, Hubertus Psaar | 1989-07-18 |
| 4835270 | Chromogenic 3,1-benzoxazines | — | 1989-05-30 |
| 4831141 | Chromogenic 3,1-benzoxazines | Gert Jabs | 1989-05-16 |