Granted Patent
Utility
US 4,477,873 · App. 06/373,254
Channel monitor for connection to channel lines
Inventor:
Edgar L. McCarley
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Apr 29, 1982
Inventor
Edgar L. McCarley
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.