Granted Patent
Utility
US 5,839,558 · App. 08/882,476
Viscous fan clutch with engage port lock
Inventor:
Lawrence C. Kennedy
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jun 25, 1997
Inventor
Lawrence C. Kennedy
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.