Granted Patent
Utility
US 4,659,491 · App. 06/686,162
Lubricating oil containing a polymer having a functionalized backbone which contains an electron withdrawing group
Inventors:
Phillip B. Valkovich, Kechia J. Chou
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Dec 24, 1984
Inventors
Phillip B. Valkovich
Kechia J. Chou
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.