Granted Patent
Utility
US 4,677,667 · App. 06/770,467
Subscriber line circuit having improved AC impedance matching
Inventor:
Robert V. Burns
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Aug 29, 1985
Inventor
Robert V. Burns
Assignee (at issue)
GTE Communication Systems 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.