Granted Patent
Utility
US 4,238,792 · App. 05/959,127
System for changing alphanumeric values that are displayed on cathode ray tube screens
Inventors:
Edwin Cohen, Charles P. L. Mortimer
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Nov 9, 1978
Inventors
Edwin Cohen
Charles P. L. Mortimer
Assignee (at issue)
The Singer Company Limited
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.