Granted Patent
Utility
US 6,120,654 · App. 09/273,006
Process for the purification of maleic anhydride
Inventors:
Henry C. Brown, William H. Alumbaugh, Joseph C. Burnett
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Mar 19, 1999
Inventors
Henry C. Brown
William H. Alumbaugh
Joseph C. Burnett
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.