Granted Patent
Utility
US 4,669,737 · App. 06/900,537
Annular shaft seal with cam portion on sealing lip
Inventor:
Harold R. Diffenderfer
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Aug 26, 1986
Inventor
Harold R. Diffenderfer
Assignee (at issue)
Neapco Holdings LLC
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.