Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4248774 | P-Sulphophenoxy-phenylazo indoles | Gerhard Wolfrum | 1981-02-03 |
| 4247460 | Disazo dyestuff sulphuric acid ester | Gerhard Wolfrum | 1981-01-27 |
| 4245995 | Stabilization of anionic indole dyestuffs | Hans Otten, Hans-Werner Petroll, Karlheinz Wolf | 1981-01-20 |
| 4231748 | Azo dyestuffs | Gerhard Wolfrum | 1980-11-04 |