Granted Patent
Utility
US 4,847,077 · App. 07/007,299
Controlled release pharmaceutical preparations
Inventor:
Yegnaswami Raghunathan
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jan 27, 1987
Inventor
Yegnaswami Raghunathan
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.