Granted Patent
Utility
US 4,582,897 · App. 06/605,989
Azo dyes
Inventors:
Dieter Mausezahl, Rudolf Hurter, Hansrudolf Schwander
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: May 2, 1984
Inventors
Dieter Mausezahl
Rudolf Hurter
Hansrudolf Schwander
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.