Granted Patent
Utility
US 6,335,497 · App. 09/496,476
De-energized tap changer
Inventors:
Stephen A. Perkins, John B. Baskin, Edgar R. Eley, Ralph S. Averitt, Juan L. Santana, Marty C. Brasher, Frank D. Wolfe, John N. Powell, James R. Scrivener
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Feb 2, 2000
Inventors
Stephen A. Perkins
John B. Baskin
Edgar R. Eley
Ralph S. Averitt
Juan L. Santana
Marty C. Brasher
Frank D. Wolfe
John N. Powell
James R. Scrivener
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.