Granted Patent
Utility
US 6,492,789 · App. 09/900,765
Method and apparatus for controlling a high-speed AC permanent magnet synchronous motor coupled to an industrial turbo engine
Inventor:
Bing Cheng
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jul 6, 2001
Inventor
Bing Cheng
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.