Granted Patent
Utility
US 4,609,791 · App. 06/683,892
Flexible diaphragm keypad and method of manufacture
Inventor:
Jean-Pierre Abbat
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Dec 20, 1984
Inventor
Jean-Pierre Abbat
Assignee (at issue)
ITT 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.