Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4201547 | Process for the preparation of azo dyestuffs on fiber materials consisting of, or containing, cellulose fibers | Erich Feess, Hartmut Springer, Willy Gronen, Horst Curtius | 1980-05-06 |
| 4195973 | Process for printing with developing dyes which employs having ether substituents derived from glycols, polyglycols, or alkoxy derivatives thereof | Hasso Hertel, Horst Curtius, Erich Feess | 1980-04-01 |