Granted Patent
Utility
US 4,476,744 · App. 06/252,959
Multi-speed fan drive apparatus
Inventor:
James W. Crooks, Jr.
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Apr 10, 1981
Inventor
James W. Crooks, Jr.
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.