Granted Patent
Utility
US 4,959,219 · App. 07/231,933
Coating barriers comprising ethyl cellulose
Inventors:
San-Laung Chow, Yegnaswami Raghunathan
Patented Case
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Granted: Sep 25, 1990
Filed: Aug 15, 1988
Inventors
San-Laung Chow
Yegnaswami Raghunathan
Assignee (at issue)
Fisons Ltd.
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.