Granted Patent
Utility
US 4,996,702 · App. 07/498,102
Apparatus for testing spare line circuits in a communication system
Inventor:
J. Warren Whitesel
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Mar 23, 1990
Inventor
J. Warren Whitesel
Assignee (at issue)
Mitel Corporation
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.