Granted Patent
Utility
US 4,746,128 · App. 07/060,508
Cassette shaft seal
Inventor:
Gerhard Freiwald
Patented Case
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Granted: May 24, 1988
Filed: Jun 11, 1987
Inventor
Gerhard Freiwald
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.