Granted Patent
Utility
US 4,667,122 · App. 06/680,327
Tachogenerator for speed control of electric motors
Inventor:
Rolf Muller
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Feb 26, 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.