Granted Patent
Utility
US 5,474,780 · App. 08/030,479
Monolithic maleic anhydride drug delivery systems
Inventor:
James N. Chang
Patented Case
View Patent ↗
Granted: Dec 12, 1995
Filed: Mar 30, 1993
Inventor
James N. Chang
Assignee (at issue)
Allergan, 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.