Granted Patent
Utility
US 4,722,331 · App. 06/772,168
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Inventor:
James Fox
Patented Case
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Granted: Feb 2, 1988
Filed: Sep 3, 1985
Inventor
James Fox
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.