Granted Patent
Utility
US 5,259,488 · App. 07/863,428
Fluid friction coupling
Inventors:
Franz-Josef Oberdorster, Paul-Erich Schonenbrucher
Patented Case
View Patent ↗
Granted: Nov 9, 1993
Filed: Apr 3, 1992
Inventors
Franz-Josef Oberdorster
Paul-Erich Schonenbrucher
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.