Inventor · disambiguated record
Erhard Worfel
Also filed as: WOERFEL ERHARD · WORFEL ERHARD
4 granted patents·33 citations·filing 1976–1982
74Inventor score
Technology areasC09B
Files withHOECHST AG4
Top patents by PatentIndex Score
4 records- 0185US4035350AProcess for the preparation of water-soluble azo dyestuffs by reacting an aromatic amine and a coupling component with alkali metal nitrite or alkyl nitrite in the absence of acidHOECHST AG·Filed 1976·Granted Jul 12, 1977·15 cites·4 claims
- 0282US4118184AStable liquid aqueous composition of a water-soluble fiber-reactive azo dyestuff, containing a buffer substance, the dyestuff having been prepared by diazotization with a nitrite and coupling in the absence of acidHOECHST AG·Filed 1977·Granted Oct 3, 1978·12 cites·5 claims
- 0350US4607096AAzo pigments obtained by diazotizing in a dipolar aprotic organic solventHOECHST AG·Filed 1982·Granted Aug 19, 1986·4 cites·7 claims
- 0442US4182708AProcess for the preparation of azo pigments by diazotizing in a dipolar aprotic organic solvent and azo pigments obtained therefromHOECHST AG·Filed 1977·Granted Jan 8, 1980·2 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →