Granted Patent
Utility
US 4,393,493 · App. 06/205,133
Automatic protection apparatus for span lines employed in high speed digital systems
Inventor:
Allan K. Edwards
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Nov 10, 1980
Inventor
Allan K. Edwards
Assignee (at issue)
International Telephone and Telegraph 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.