Granted Patent
Utility
US 4,922,776 · App. 07/202,470
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Inventor:
William Cook
Patented Case
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Granted: May 8, 1990
Filed: Jun 6, 1988
Inventor
William Cook
Assignee (at issue)
Sandy Hill Corporation
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.