Granted Patent
Utility
US 6,517,078 · App. 09/990,266
Face seal device with additional mass for high rotational speeds
Inventors:
Andreas Schruefer, Werner Wolf, Guenther Lederer, Peter Droescher, Josef Nosowicz, Georg Steigenberger
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Nov 23, 2001
Inventors
Andreas Schruefer
Werner Wolf
Guenther Lederer
Peter Droescher
Josef Nosowicz
Georg Steigenberger
Assignee (at issue)
Burgmann Dichtungswerke GmbH and Co. KG
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.