Granted Patent
Utility
US 4,221,778 · App. 06/001,644
Prolonged release pharmaceutical preparations
Inventor:
Yegnaswami Raghunathan
Patented Case
View Patent ↗
Granted: Sep 9, 1980
Filed: Jan 8, 1979
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.