Granted Patent
Utility
US 5,314,039 · App. 07/994,925
Drive assembly for a four wheel drive vehicle, having a disconnectable viscous coupling
Inventor:
Michael Hock
Patented Case
View Patent ↗
Granted: May 24, 1994
Filed: Dec 22, 1992
Inventor
Michael Hock
Assignee (at issue)
Viscodrive GmbH
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.