Granted Patent
Utility
US 4,436,661 · App. 06/327,380
3-Substituted bicyclic azetidinone derivatives
Inventor:
Hans Rudolf Pfaendler
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Dec 4, 1981
Inventor
Hans Rudolf Pfaendler
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.