Granted Patent
Utility
US 4,663,147 · App. 06/771,816
Disc-like sustained release formulation
Inventor:
Randolph B. DePrince
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Sep 3, 1985
Inventor
Randolph B. DePrince
Assignee (at issue)
International Minerals & Chemical Corp.
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.