Granted Patent
Utility
US 4,972,055 · App. 07/458,933
Multiple vacuum interrupter fluid insulated circuit breaker with isolation gap
Inventors:
John R. Perulfi, Joseph R. Rostron
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Dec 29, 1989
Inventors
John R. Perulfi
Joseph R. Rostron
Assignee (at issue)
ABB Power T&D Company Inc.
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.