Granted Patent
Utility
US 5,226,489 · App. 07/819,423
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Inventors:
Gerald L. Woods, Steven D. Shirk
Patented Case
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Granted: Jul 13, 1993
Filed: Jan 10, 1992
Inventors
Gerald L. Woods
Steven D. Shirk
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.