Granted Patent
Utility
US 5,055,640 · App. 07/493,834
Multi-pin vacuum switch arrangement
Inventors:
Bruno Lippi, Ernst Suter, Hans Wuthrich, Thomas Meier
Patented Case
View Patent ↗
Granted: Oct 8, 1991
Filed: Mar 9, 1990
Inventors
Bruno Lippi
Ernst Suter
Hans Wuthrich
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.