Granted Patent
Utility
US 5,654,620 · App. 08/401,450
Sensorless speed detection circuit and method for induction motors
Inventor:
Phillip Gerard Langhorst
Patented Case
View Patent ↗
Granted: Aug 5, 1997
Filed: Mar 9, 1995
Inventor
Phillip Gerard Langhorst
Assignee (at issue)
Magnetek, Inc.
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.