Granted Patent
Utility
US 4,990,880 · App. 07/384,741
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Inventor:
Guy D. Albert
Patented Case
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Granted: Feb 5, 1991
Filed: Jul 24, 1989
Inventor
Guy D. Albert
Assignee (at issue)
Alcatel NA, 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.