Granted Patent
Utility
US 4,456,764 · App. 06/420,452
Process for the manufacture of maleic anhydride
Inventor:
James T. Wrobleski
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Sep 20, 1982
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.