Granted Patent
Utility
US 5,013,469 · App. 07/397,946
VI improver, dispersant, and anti-oxidant additive and lubricating oil composition containing same
Inventors:
Thomas F. DeRosa, Theodore E. Nalesnik, Benjamin J. Kaufman
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Aug 24, 1989
Inventors
Thomas F. DeRosa
Theodore E. Nalesnik
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.