Granted Patent
Utility
US 4,766,131 · App. 06/948,449
2-amino (or hydroxy) phenethyl-1,2,3,4-tetrahydroisoquinolines as analgesics
Inventors:
Thomas A. Davidson, Ronald C. Griffith
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Dec 30, 1986
Inventors
Thomas A. Davidson
Ronald C. Griffith
Assignee (at issue)
Pennwalt Corporation
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.