Granted Patent
Utility
US 4,391,845 · App. 06/323,023
Method of making a membrane switch
Inventor:
Ronald S. Denley
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Nov 19, 1981
Inventor
Ronald S. Denley
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.