Granted Patent
Utility
US 5,226,970 · App. 07/694,531
Electrical transformer remanufacturing process for removal of contaminants
Inventors:
David A. Barnett, John R. Daniels
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: May 1, 1991
Inventors
David A. Barnett
John R. Daniels
Assignee (at issue)
Federal Signal Corporation
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.