Granted Patent
Utility
US 4,305,946 · App. 06/166,678
Propargyl thio-nitro-pyridines
Inventor:
Josef Ehrenfreund
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Jul 7, 1980
Inventor
Josef Ehrenfreund
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.