Granted Patent
Utility
US 5,374,364 · App. 08/115,839
Multifunction viscosity index improvers
Inventors:
Maria M. Kapuscinski, Nicholas Benfaremo, Robert T. Biggs
Patented Case
View Patent ↗
Granted: Dec 20, 1994
Filed: Sep 3, 1993
Inventors
Maria M. Kapuscinski
Nicholas Benfaremo
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.