Granted Patent
Utility
US 4,461,994 · App. 06/359,701
Permanent magnet inductor tachometer
Inventor:
Daniel J. MacDonald
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Mar 19, 1982
Inventor
Daniel J. MacDonald
Assignee (at issue)
Litton Industrial Products, 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.