Granted Patent
Utility
US 4,649,331 · App. 06/733,160
Flux-weakening regime operation of an interior permanent magnet synchronous motor
Inventor:
Thomas Merlin Jahns
Patented Case
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Granted: Mar 10, 1987
Filed: May 13, 1985
Inventor
Thomas Merlin Jahns
Assignee (at issue)
General Electric Company
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.