Granted Patent
Utility
US 4,793,601 · App. 06/530,881
Key spring
Inventors:
Peter Wild, Johannes Rometsch, Werner Frey, Karl Iseli
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Sep 7, 1983
Inventors
Peter Wild
Johannes Rometsch
Werner Frey
Karl Iseli
Assignee (at issue)
Alcatel N.V.
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.