Granted Patent
Utility
US 4,220,821 · App. 05/916,392
Off-hook initiated demand assignment communications
Inventor:
Jerome LUCAS
Patented Case
View Patent ↗
Granted: Sep 2, 1980
Filed: Jun 16, 1978
Inventor
Jerome LUCAS
Assignee (at issue)
Communications Satellite 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.