Granted Patent
Utility
US 5,090,534 · App. 07/570,292
Spacing ring for spacing the plates of a viscous coupling
Inventor:
Joachim Horst
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Aug 20, 1990
Inventor
Joachim Horst
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.