Granted Patent
Utility
US 4,661,625 · App. 06/803,321
Synthesis and purification of d-propoxyphene hydrochloride
Inventor:
Carl White
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Dec 2, 1985
Inventor
Carl White
Assignee (at issue)
Mallinckodt Inc.
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.