Granted Patent
Utility
US 4,583,191 · App. 06/520,049
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Inventor:
Gregory Hubert Piesinger
Patented Case
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Granted: Apr 15, 1986
Filed: Aug 4, 1983
Inventor
Gregory Hubert Piesinger
Assignee (at issue)
Sperry Corp.
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.