Granted Patent
Utility
US 4,579,952 · App. 06/517,238
Intermediates for octahydrobenzofuro[3,2-e]isoquinolines
Inventors:
Engelbert Ciganek, Ashokkumar B. Shenvi
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Jul 25, 1983
Inventors
Engelbert Ciganek
Ashokkumar B. Shenvi
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.