Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4987221 | Bisdiazonium salts of 4,4'-diamino-3,3'-dialkoxybiphenyls and a process for their preparation | Klaus Hunger, Heinrich Frolich | 1991-01-22 |
| 4906250 | Process for the preparation of water-insoluble azo dyes on the fiber: impregnating with coupling component and treating with diazonium salt of 4-chloro-2,5-dialkoxy aniline | — | 1990-03-06 |
| 4696675 | Process for preparing water-insoluble blue azo dyes on the fiber: hydroxynaphthoic amide and diazotized di-alkoxy-benzidine | Klaus Hunger, Heinrich Frolich | 1987-09-29 |
| 4599450 | Process for the preparation of acid nitro dyestuffs | — | 1986-07-08 |
| 4591359 | Process for preparing acid nitro dyestuffs for leather | — | 1986-05-27 |
| 4368054 | Compositions of nitro-anilines for producing azo dyes on fibers | — | 1983-01-11 |
| 4331443 | Concentrated solutions of water-insoluble coupling components | Rudolf Kostka | 1982-05-25 |
| 4306876 | Aqueous dispersions of primary aromatic amines, their use for the production of water-insoluble azo dyes on the fiber and the use of an anionic surfactant for the manufacture of said dispersions | — | 1981-12-22 |
| 4224027 | Process for the production of water-insoluble azo dyestuffs on the fiber with polyphosphate | Adolf Trampusch | 1980-09-23 |
| 4195973 | Process for printing with developing dyes which employs having ether substituents derived from glycols, polyglycols, or alkoxy derivatives thereof | Horst Curtius, Erich Feess, Paul Karacsonyi | 1980-04-01 |
| 4183727 | Process for the production of water-insoluble azo dyestuffs on the fiber | Peter Frey | 1980-01-15 |