Granted Patent
Utility
US 4,699,573 · App. 06/310,569
Transformer oil pump bearing material
Inventors:
Edward M. Petrie, Clifford J. Bell
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Oct 13, 1981
Inventors
Edward M. Petrie
Clifford J. Bell
Assignee (at issue)
Westinghouse Electric Company LLC
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.