Granted Patent
Utility
US 4,397,592 · App. 06/205,440
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Inventor:
Robert A. Erickson
Patented Case
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Granted: Aug 9, 1983
Filed: Nov 10, 1980
Inventor
Robert A. Erickson
Assignee (at issue)
KENNAMETAL 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.