Granted Patent
Utility
US 5,019,287 · App. 07/444,221
Enhanced wear resistant additive and lubrication oil composition containing same
Inventors:
Thomas F. DeRosa, Benjamin J. Kaufman, Rosemary J. Jennejahn
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Dec 1, 1989
Inventors
Thomas F. DeRosa
Benjamin J. Kaufman
Rosemary J. Jennejahn
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.