Granted Patent
Utility
US 4,310,694 · App. 06/224,982
P-(Alkenylamino) phenylamines
Inventor:
Josef Ehrenfreund
Patented Case
View Patent ↗
Granted: Jan 12, 1982
Filed: Jan 14, 1981
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.