Granted Patent
Utility
US 4,265,495 · App. 06/068,173
Engine block and crankshaft bearing seal
Inventor:
Robert R. Backlin
Patented Case
View Patent ↗
Granted: May 5, 1981
Filed: Aug 20, 1979
Inventor
Robert R. Backlin
Assignee (at issue)
Allis-Chalmers 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.