Granted Patent
Utility
US 4,394,767 · App. 06/281,059
Data transmission over long distance circuits
Inventor:
Martin Shum
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Jul 7, 1981
Inventor
Martin Shum
Assignee (at issue)
General DataComm Industries, Inc.
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.