Granted Patent
Utility
US 4,002,871 · App. 05/534,825
Column leaf spring push-button switch for use in a keyboard
Inventor:
Dewey M. Sims, Jr.
Patented Case
View Patent ↗
Granted: Jan 11, 1977
Filed: Dec 20, 1974
Inventor
Dewey M. Sims, Jr.
Assignee (at issue)
Burroughs, 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.