Granted Patent
Utility
US 4,679,243 · App. 06/764,984
Data transmission using a transparent tone-in band system
Inventors:
Joseph P. McGeehan, Andrew Bateman
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Aug 12, 1985
Inventors
Joseph P. McGeehan
Andrew Bateman
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.