Granted Patent
Utility
US 4,324,962 · App. 06/196,446
Membrane switch having a puff ink spacer
Inventor:
Edwina K. Dulen
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Oct 14, 1980
Inventor
Edwina K. Dulen
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.