Granted Patent
Utility
US 4,195,852 · App. 05/875,490
End face seal assembly
Inventors:
Robert D. Roley, James R. Sturges
Patented Case
View Patent ↗
Granted: Apr 1, 1980
Filed: Feb 6, 1978
Inventors
Robert D. Roley
James R. Sturges
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.