Granted Patent
Utility
US 4,672,603 · App. 06/803,696
Combined analog/digital CCIS data transmitter/receiver circuit
Inventor:
Joseph A. Conforti
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Dec 2, 1985
Inventor
Joseph A. Conforti
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.