Granted Patent
Utility
US 4,973,413 · App. 07/457,218
Multifunctional viscosity index improver additive and lubricating oil composition containing same
Inventors:
Thomas F. DeRosa, Benjamin J. Kaufman, Edward F. Miller, Rosemary J. Jennejahn
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Dec 26, 1989
Inventors
Thomas F. DeRosa
Benjamin J. Kaufman
Edward F. Miller
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.