Granted Patent
Utility
US 5,169,546 · App. 07/546,998
Multifunctional viscosity index improvers having dispersant and antioxidant properties and lubricating oil composition containing same
Inventors:
Theodore E. Nalesnik, Sheldon Herbstman
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jul 2, 1990
Inventors
Theodore E. Nalesnik
Sheldon Herbstman
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.