Granted Patent
Utility
US 4,750,166 · App. 06/879,055
Conference circuit
Inventors:
Stephen M. Illman, Martin Sharpe
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Jun 26, 1986
Inventors
Stephen M. Illman
Martin Sharpe
Assignee (at issue)
STC PLC
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.