Granted Patent
Utility
US 6,476,237 · App. 10/083,230
Purification of alkylene carbonates
Inventors:
James R. Machac, Jr., Ralph M. DiGuilio, John R. Sanderson, Ronald L. Savage
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: Feb 26, 2002
Inventors
James R. Machac, Jr.
Ralph M. DiGuilio
John R. Sanderson
Ronald L. Savage
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.