Granted Patent
Utility
US 4,394,703 · App. 06/334,188
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Inventor:
James S. Butcher
Patented Case
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Granted: Jul 19, 1983
Filed: Dec 24, 1981
Inventor
James S. Butcher
Assignee (at issue)
GTE Automatic Electric Labs 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.