Granted Patent
Utility
US 4,602,084 · App. 06/512,089
Monoazo dyes containing a 4-substituted-2-azo-1,1'-diphenylsulfone component
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Jul 8, 1983
Inventor
Rudolf Hurter
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.