Granted Patent
Utility
US 6,177,521 · App. 08/340,966
Hydrogenation of polymers
Inventors:
Carma J. Gibler, David M. Austgen, Jr., Roy Parker
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Nov 17, 1994
Inventors
Carma J. Gibler
David M. Austgen, Jr.
Roy Parker
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.