Granted Patent
Utility
US 4,420,744 · App. 06/233,903
Keyboard crosspoint encoder having N-key rollover
Inventor:
Joseph Jesson
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Feb 12, 1981
Inventor
Joseph Jesson
Assignee (at issue)
Oak 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.