Granted Patent
Utility
US 4,262,914 · App. 06/140,382
End face seal assembly
Inventor:
Robert D. Roley
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Dec 3, 1979
Inventor
Robert D. Roley
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.