Granted Patent
Utility
US 5,332,806 · App. 07/989,735
Disazo dyes which contain 2-hydroxynaphthyl moiety
Inventor:
Rudolf Hurter
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Dec 10, 1992
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.