Granted Patent
Utility
US 4,924,156 · App. 07/199,232
Driver circuit for a D.C. motor without commutator
Inventor:
Rolf Muller
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: May 27, 1988
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.