Granted Patent
Utility
US 5,371,201 · App. 08/048,081
Azo dyes and preparation and use thereof
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Apr 15, 1993
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.