Granted Patent
Utility
US 4,911,454 · App. 07/364,566
Radial shaft sealing ring
Inventors:
Hermann Rapp, Konrad Mader, Volker Schwarz
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Jun 5, 1989
Inventors
Hermann Rapp
Konrad Mader
Volker Schwarz
Assignee (at issue)
Firma Carl Freudenberg
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.