Granted Patent
Utility
US 4,495,616 · App. 06/427,970
PCM Conference circuit
Inventor:
Bruce D. Shuh
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Sep 29, 1982
Inventor
Bruce D. Shuh
Assignee (at issue)
International Standard Electric 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.