Granted Patent
Utility
US 4,272,263 · App. 06/040,693
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Inventor:
Terence M. Hancock
Patented Case
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Granted: Jun 9, 1981
Filed: May 21, 1979
Inventor
Terence M. Hancock
Assignee (at issue)
AMERICAN AIR FILTER COMPANY, 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.