Granted Patent
Utility
US 5,275,746 · App. 07/571,815
Multifunctional viscosity index improver containing phenothiazine
Inventors:
Maria M. Kapuscinski, Benjamin J. Kaufman, Theodore E. Nalesnik, Robert T. Biggs
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: Aug 24, 1990
Inventors
Maria M. Kapuscinski
Benjamin J. Kaufman
Theodore E. Nalesnik
Robert T. Biggs
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.