Granted Patent
Utility
US 4,843,151 · App. 07/036,423
Monoazo dyes containing a 4'-methyl-3'-sulfo-5-acylamino-2-azo-1,1'-diphenylsulfone component
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Apr 9, 1987
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.