Granted Patent
Utility
US 6,470,644 · App. 09/813,694
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Inventors:
Stephen Mark James, Kenneth Herman Beaty
Patented Case
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Granted: Oct 29, 2002
Filed: Mar 21, 2001
Inventors
Stephen Mark James
Kenneth Herman Beaty
Assignee (at issue)
Varco Pruden Technologies, 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.