Granted Patent
Utility
US 5,567,923 · App. 08/371,394
Puffer circuit-breaker having a pneumatically-locked semi-moving piston
Inventor:
Michel Perret
Patented Case
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Granted: Oct 22, 1996
Filed: Jan 11, 1995
Inventor
Michel Perret
Assignee (at issue)
GEC Alsthom T&D SA
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.