Granted Patent
Utility
US 4,608,686 · App. 06/422,188
Two wire voice and data subscriber loop
Inventor:
John A. Barsellotti
Patented Case
View Patent ↗
Granted: Aug 26, 1986
Filed: Sep 23, 1982
Inventor
John A. Barsellotti
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.