Granted Patent
Utility
US 4,552,997 · App. 06/566,247
Arrangement for loop analysis testing for a digital switching system
Inventors:
William R. Daniels, John Stewart Young
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Dec 28, 1983
Inventors
William R. Daniels
John Stewart Young
Assignee (at issue)
GTE Automatic Electric 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.