Granted Patent
Utility
US 4,313,402 · App. 06/098,800
Internal combustion engine radiator cooling fan drive motor control system
Inventors:
Richard N. Lehnhoff, William C. Staker
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Nov 30, 1979
Inventors
Richard N. Lehnhoff
William C. Staker
Assignee (at issue)
General Motors LLC
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.