Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879373 | 1-(dichloro-4'-sulfamoyl or substituted sulfamoyl-phenyazo)-2-hydroxy-3-phenylcarbamoyl or substituted phenylcarbamoyl-naphthalenes | — | 1989-11-07 |
| 4866113 | Compounds useful as pigments containing one or more 2,2,6,6-tetraalkylpiperidine groups | Peter Bitterli, Manfred Geisel, Jurgen Goldmann | 1989-09-12 |
| 4838943 | Compounds useful as pigments containing one or more 2,2,6,6-tetraalkylpiperidine groups | Peter Bitterli, Manfred Geisel, Jurgen Goldmann | 1989-06-13 |