Granted Patent
Utility
US 6,235,931 · App. 09/223,549
Partial oxidation of polyoxyalkylene polyol compositions to polycarboxylic acid compositions
Inventors:
Pen-Chung Wang, Gayle Edward Back, Glynnda Addicks, Jimmie Dale Elmore, Herbert E. Fried
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Dec 30, 1998
Inventors
Pen-Chung Wang
Gayle Edward Back
Glynnda Addicks
Jimmie Dale Elmore
Herbert E. Fried
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.