Granted Patent
Utility
US 4,703,209 · App. 06/857,474
Electric motor, especially collectorless d.c. motor, with an outside rotor
Inventor:
Guenter Wrobel
Patented Case
View Patent ↗
Granted: Oct 27, 1987
Filed: Apr 30, 1986
Inventor
Guenter Wrobel
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.