Granted Patent
Utility
US 4,544,739 · App. 06/425,595
Fibre-reactive chromium complex Azo-azomethine dyes
Inventors:
Hans U. Schutz, Arthur Buhler
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Sep 28, 1982
Inventors
Hans U. Schutz
Arthur Buhler
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.