Granted Patent
Utility
US 5,152,909 · App. 07/688,802
Antioxidant/corrosion resistant additive for railway diesel crankcase lubricants
Inventors:
Thomas F. DeRosa, Rodney L. Sung, Benjamin J. Kaufman
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Apr 22, 1991
Inventors
Thomas F. DeRosa
Rodney L. Sung
Benjamin J. Kaufman
Assignee (at issue)
Texaco Inc.
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.