Granted Patent
Utility
US 4,378,478 · App. 06/296,628
Double-domed elastomeric keyboard element
Inventor:
Reinhard Deeg
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Aug 27, 1981
Inventor
Reinhard Deeg
Assignee (at issue)
International Standard Electric 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.