Granted Patent
Utility
US 4,751,355 · App. 07/070,985
Pushbutton switch with combined restoring-tactile feel spring
Inventors:
Klaus B. Wisskirchen, Klaus Hinze, Wolfgang Schulze, Reinhard L. Fricke, Alfred Heeb, Dieter Michalski
Patented Case
View Patent ↗
Granted: Jun 14, 1988
Filed: Jul 8, 1987
Inventors
Klaus B. Wisskirchen
Klaus Hinze
Wolfgang Schulze
Reinhard L. Fricke
Alfred Heeb
Dieter Michalski
Assignee (at issue)
Rudolph Schadow GmbH
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.