Granted Patent
Utility
US 5,140,625 · App. 07/664,402
System for testing 2B1Q telephony loopback circuits and method therefor
Inventors:
Peter M. Reum, Terry D. Bolinger
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Mar 4, 1991
Inventors
Peter M. Reum
Terry D. Bolinger
Assignee (at issue)
XEL Communications, 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.