Granted Patent
Utility
US 5,582,837 · App. 08/453,144
Alkyl-substituted cellulose-based sustained-release oral drug dosage forms
Inventor:
John W. Shell
Patented Case
View Patent ↗
Granted: Dec 10, 1996
Filed: May 30, 1995
Inventor
John W. Shell
Assignee (at issue)
Depomed, 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.