Granted Patent
Utility
US 4,456,876 · App. 06/388,307
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Inventor:
James Haymaker
Patented Case
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Granted: Jun 26, 1984
Filed: Jun 14, 1982
Inventor
James Haymaker
Assignee (at issue)
AT&T Technologies Incorporated
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.