Granted Patent
Utility
US 4,496,481 · App. 06/329,860
Production of azo compounds
Inventor:
Ian Robert Wheeler
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Dec 11, 1981
Inventor
Ian Robert Wheeler
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.