Granted Patent
Utility
US 6,242,538 · App. 09/304,915
Process for making hydrogenated gel-free functionalized anionically polymerized polymers
Inventors:
Robert C. Bening, Carl L. Willis, John D. Wilkey, Zaida Diaz
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: May 4, 1999
Inventors
Robert C. Bening
Carl L. Willis
John D. Wilkey
Zaida Diaz
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.