Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866113 | Compounds useful as pigments containing one or more 2,2,6,6-tetraalkylpiperidine groups | Peter Bitterli, Manfred Geisel, Bansi Lal Kaul | 1989-09-12 |
| 4838943 | Compounds useful as pigments containing one or more 2,2,6,6-tetraalkylpiperidine groups | Peter Bitterli, Manfred Geisel, Bansi Lal Kaul | 1989-06-13 |