Granted Patent
Utility
US 4,291,264 · App. 06/072,523
Power factor control system for inverter-driven a-c induction motor
Inventor:
Edward C. Siemon
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Sep 4, 1979
Inventor
Edward C. Siemon
Assignee (at issue)
BorgWarner 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.