Granted Patent
Utility
US 4,405,841 · App. 06/401,075
Movable member membrane switch
Inventor:
Anthony J. Van Zeeland
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Jul 23, 1982
Inventor
Anthony J. Van Zeeland
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.