Granted Patent
Utility
US 4,084,071 · App. 05/748,025
Switch mechanism for a calculator type keyboard
Inventor:
Theodore D. Smith
Patented Case
View Patent ↗
Granted: Apr 11, 1978
Filed: Dec 6, 1976
Inventor
Theodore D. Smith
Assignee (at issue)
RCA 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.