Granted Patent
Utility
US 6,667,452 · App. 10/082,317
High-voltage circuit-breaker having a spring-loaded control mechanism with an energy-recovering additional spring
Inventor:
Hubert Spiegel
Patented Case
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Granted: Dec 23, 2003
Filed: Feb 26, 2002
Inventor
Hubert Spiegel
Assignee (at issue)
ALSTOM Holdings
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.