Granted Patent
Utility
US 4,415,547 · App. 06/388,435
Sustained-release pharmaceutical tablet and process for preparation thereof
Inventors:
Andrew B. C. Yu, Phillip M. John
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Jun 14, 1982
Inventors
Andrew B. C. Yu
Phillip 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.