Granted Patent
Utility
US 4,623,720 · App. 06/270,571
1:2 metal complexes of AZO compounds having a central substituted phenylenesulfonylaminophenylene radical
Inventor:
Herbert Holliger
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Jun 4, 1981
Inventor
Herbert Holliger
Assignee (at issue)
Sandoz AG
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.