Granted Patent
Utility
US 4,996,397 · App. 07/482,919
Spring-force drive for a power switch
Inventors:
Max Kuhn, Rudi Schmidt
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Feb 22, 1990
Inventors
Max Kuhn
Rudi Schmidt
Assignee (at issue)
Sprecher Energie AG
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.