Granted Patent
Utility
US 4,259,652 · App. 06/034,108
Reversing relay for permanent magnet DC motor
Inventor:
Richard W. Mattson
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Apr 30, 1979
Inventor
Richard W. Mattson
Assignee (at issue)
Eltra Corporation
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.