Granted Patent
Utility
US 4,398,180 · App. 06/274,895
Contactless keyboard
Inventors:
Johannes Rometsch, Werner Frey, Hans Diem
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Jun 18, 1981
Inventors
Johannes Rometsch
Werner Frey
Hans Diem
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.