Granted Patent
Utility
US 5,419,417 · App. 08/186,772
Viscous coupling
Inventor:
Heinz Madsack
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: Jan 26, 1994
Inventor
Heinz Madsack
Assignee (at issue)
GKN 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.