Granted Patent
Utility
US 4,438,362 · App. 06/409,712
Self-starting, direct current motor with permanent magnets of varied magnetic strength
Inventor:
Fred A. Brown
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Aug 19, 1982
Inventor
Fred A. Brown
Assignee (at issue)
Rotron, 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.