Granted Patent
Utility
US 5,021,177 · App. 07/513,374
Dispersant-antioxidant multifunctional viscosity index improver
Inventors:
Maria M. Kapuscinski, Thomas F. DeRosa, Robert T. Biggs, Theodore E. Nalesnik
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Apr 23, 1990
Inventors
Maria M. Kapuscinski
Thomas F. DeRosa
Robert T. Biggs
Theodore E. Nalesnik
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.