Granted Patent
Utility
US 5,135,671 · App. 07/690,240
Multifunctional viscosity index improver containing units from unsaturated chlorides and aromatic amines
Inventors:
Maria M. Kapuscinski, Theodore E. Nalesnik, Robert T. Biggs, Raymond C. Schlicht
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Apr 24, 1991
Inventors
Maria M. Kapuscinski
Theodore E. Nalesnik
Robert T. Biggs
Raymond C. Schlicht
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.