Granted Patent
Utility
US 4,357,550 · App. 06/111,991
Brushless D.C. motor
Inventor:
Siegfried Muller
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: Jan 14, 1980
Inventor
Siegfried Muller
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.