Granted Patent
Utility
US 6,642,407 · App. 10/133,083
Production, purification and polymerization of aromatic dicarboxylic acids
Inventors:
Krishna K. Rao, Russell D. Sellen, Xiaobing Feng, James Spanswick, William F. Huber, Jr.
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Apr 26, 2002
Inventors
Krishna K. Rao
Russell D. Sellen
Xiaobing Feng
James Spanswick
William F. Huber, Jr.
Assignee (at issue)
ExxonMobil Chemical Patents 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.