Granted Patent
Utility
US 6,458,969 · App. 10/071,169
Process for the purification of alkylene carbonate
Inventors:
James R. Machac, Jr., Edward T. Marquis, Ronald L. Savage, Susan A. Woodrum, John R. Sanderson
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Mar 29, 2002
Inventors
James R. Machac, Jr.
Edward T. Marquis
Ronald L. Savage
Susan A. Woodrum
John R. Sanderson
Assignee (at issue)
HUNTSMAN PETROCHEMICAL LLC
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.