Granted Patent
Utility
US 4,432,898 · App. 06/199,789
Sulfo-substituted fibre-reactive 1:2-chromium complex azo dyes
Inventors:
Gerhard Back, Fabio Beffa, Hans U. Schutz
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Oct 23, 1980
Inventors
Gerhard Back
Fabio Beffa
Hans U. Schutz
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.