Granted Patent
Utility
US 4,153,677 · App. 05/907,036
Controlled-release composition
Inventor:
Philip M. John
Patented Case
View Patent ↗
Granted: May 8, 1979
Filed: May 18, 1978
Inventor
Philip M. John
Assignee (at issue)
Sterling Drug, 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.