Granted Patent
Utility
US 4,910,299 · App. 07/127,813
Disperse azo dyes containing N-phenoxyalkyleneanilines as coupling components
Inventors:
Angelo D. Casa, Peter Liechti, Max Dempfle
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Dec 2, 1987
Inventors
Angelo D. Casa
Peter Liechti
Max Dempfle
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.