Granted Patent
Utility
US 4,762,709 · App. 06/825,681
Liquid prolonged release pharmaceutical formulations containing ionic constituents
Inventor:
Jerry L. Sheumaker
Patented Case
View Patent ↗
Granted: Aug 9, 1988
Filed: Jan 31, 1986
Inventor
Jerry L. Sheumaker
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.