Granted Patent
Utility
US 4,223,646 · App. 05/878,564
Hydraulic fan drive system
Inventor:
Mark Kinder
Patented Case
View Patent ↗
Granted: Sep 23, 1980
Filed: Feb 16, 1978
Inventor
Mark Kinder
Assignee (at issue)
TRW Limited
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.