Granted Patent
Utility
US 5,091,615 · App. 07/465,749
Vacuum switch
Inventors:
Bruno Lippi, Ernst Suter, Thomas Meier
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Jan 18, 1990
Inventors
Bruno Lippi
Ernst Suter
Thomas Meier
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.