Granted Patent
Utility
US 6,548,931 · App. 09/995,024
Hybrid permanent magnet/synchronous machines
Inventors:
Feng Liang, John Michael Miller, Xingyi Xu
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Nov 26, 2001
Inventors
Feng Liang
John Michael Miller
Xingyi Xu
Assignee (at issue)
BALLARD POWER SYSTEMS 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.