Granted Patent
Utility
US 4,233,522 · App. 05/956,278
Capacitive touch switch array
Inventors:
William L. Grummer, Hendrik B. Hendriks
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Oct 30, 1978
Inventors
William L. Grummer
Hendrik B. Hendriks
Assignee (at issue)
General Electric Company
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.