Granted Patent
Utility
US 4,745,601 · App. 06/790,687
Digital service unit with secondary channel diagnostics
Inventors:
Jose R. Diaz, Norman J. Donaghue, Jr.
Patented Case
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Granted: May 17, 1988
Filed: Oct 23, 1985
Inventors
Jose R. Diaz
Norman J. Donaghue, Jr.
Assignee (at issue)
Racal Data Communications, 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.