Granted Patent
Utility
US 5,041,292 · App. 07/473,645
Biodegradable hydrogel matrices for the controlled release of pharmacologically active agents
Inventor:
Jan Feijen
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Feb 1, 1990
Inventor
Jan Feijen
Assignee (at issue)
TheraTech, Inc.
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.