Granted Patent
Utility
US 4,477,456 · App. 06/370,137
Octahydro-4A,7-ethano- and -etheno-benzofuro[3,2-e]isoquinoline derivatives having analgesic, narcotic antagonist and anorexigenic properties
Inventor:
Engelbert Ciganek
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Apr 22, 1982
Inventor
Engelbert Ciganek
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.