Granted Patent
Utility
US 4,385,250 · App. 06/224,263
Synchronous motor having gradual edge effect
Inventor:
Ross D. Welburn
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Jan 12, 1981
Inventor
Ross D. Welburn
Assignee (at issue)
Compumotor 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.