Granted Patent
Utility
US 4,345,768 · App. 06/108,907
Self pumping seal for a reciprocating member
Inventor:
Michael A. Roussin
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Oct 29, 1979
Inventor
Michael A. Roussin
Assignee (at issue)
Caterpillar Tractor Co.
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.