Granted Patent
Utility
US 4,381,561 · App. 06/199,806
All digital LSI line circuit for analog lines
Inventor:
Robert Treiber
Patented Case
View Patent ↗
Granted: Apr 26, 1983
Filed: Oct 23, 1980
Inventor
Robert Treiber
Assignee (at issue)
International Telephone and Telegraph 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.