Granted Patent
Utility
US 5,169,639 · App. 07/736,031
Controlled release verapamil tablets
Inventors:
Anand R. Baichwal, John Staniforth
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jul 25, 1991
Inventors
Anand R. Baichwal
John Staniforth
Assignee (at issue)
Edward Mendell & Co.
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.