Granted Patent
Utility
US 5,460,739 · App. 08/303,972
Star polymer viscosity index improver for oil compositions
Inventors:
Robert B. Rhodes, Dale L. Handlin, Jr., Craig A. Stevens
Patented Case
View Patent ↗
Granted: Oct 24, 1995
Filed: Sep 9, 1994
Inventors
Robert B. Rhodes
Dale L. Handlin, Jr.
Craig A. Stevens
Assignee (at issue)
SHELL OIL COMPANY
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.