Granted Patent
Utility
US 5,920,138 · App. 09/024,751
Motor/generator and axial magnetic bearing utilizing common magnetic circuit
Inventors:
David B. Clifton, Joseph F. Pinkerton, James A. Andrews, Scott R. Little
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Feb 17, 1998
Inventors
David B. Clifton
Joseph F. Pinkerton
James A. Andrews
Scott R. Little
Assignee (at issue)
Active Power, 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.