Granted Patent
Utility
US 4,355,209 · App. 06/220,669
Programmable line circuit
Inventor:
Robert J. Sabon
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Dec 29, 1980
Inventor
Robert J. Sabon
Assignee (at issue)
GTE Automatic Electric Labs 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.