Granted Patent
Utility
US 4,717,850 · App. 06/733,132
Two-pulse brushless d.c. motor with auxiliary rotor poles
Inventor:
Rolf Muller
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: May 10, 1985
Inventor
Rolf Muller
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.