Granted Patent
Utility
US 4,515,973 · App. 06/566,378
Process for producing maleic anhydride
Inventor:
James T. Wrobleski
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Dec 28, 1983
Inventor
James T. Wrobleski
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.