Granted Patent
Utility
US 4,240,014 · App. 05/964,373
Precision motor speed control system
Inventor:
Rolf Muller
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Nov 28, 1978
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.