Granted Patent
Utility
US 4,794,591 · App. 07/137,904
Digital voice switch for a multi-port conference circuit
Inventors:
James Hoff, Arthur L. Walsh, John Stewart Young
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Dec 28, 1987
Inventors
James Hoff
Arthur L. Walsh
John Stewart Young
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.