Granted Patent
Utility
US 5,085,476 · App. 07/682,524
Drum ring seal
Inventor:
Charles Fuehrer
Patented Case
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Granted: Feb 4, 1992
Filed: Apr 9, 1991
Inventor
Charles Fuehrer
Assignee (at issue)
Stoffel Seals Corporation
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.