Granted Patent
Utility
US 4,304,723 · App. 06/189,535
Process for manufacturing maleic anhydride
Inventor:
Marshall C. Freerks
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Sep 22, 1980
Inventor
Marshall C. Freerks
Assignee (at issue)
Monsanto Company
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.