Granted Patent
Utility
US 4,542,323 · App. 06/499,670
Direct current motor without commutator
Inventor:
Benno Doemen
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Jun 1, 1983
Inventor
Benno Doemen
Assignee (at issue)
Papst Motoren GmbH & Co KG
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.