Granted Patent
Utility
US 6,186,507 · App. 08/937,427
Retrofittable severe duty seal for a shaft
Inventor:
Michael R. Oldenburg
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Sep 25, 1997
Inventor
Michael R. Oldenburg
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.