Granted Patent
Utility
US 5,631,387 · App. 08/406,674
Process for the preparation and recovery of maleic anhydride
Inventors:
Henry C. Brown, William H. Alumbaugh
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: Mar 20, 1995
Inventors
Henry C. Brown
William H. Alumbaugh
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.