Granted Patent
Utility
US 5,296,228 · App. 07/850,866
Compositions for controlled delivery of pharmaceutical compounds
Inventors:
Nienyuan J. Chang, Kenneth J. Himmelstein
Patented Case
View Patent ↗
Granted: Mar 22, 1994
Filed: Mar 13, 1992
Inventors
Nienyuan J. Chang
Kenneth J. Himmelstein
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.