Granted Patent
Utility
US 4,306,181 · App. 06/067,364
Drive circuitry for electric motor
Inventor:
Ross D. Welburn
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Aug 17, 1979
Inventor
Ross D. Welburn
Assignee (at issue)
Compumotion Corporation
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.