Granted Patent
Utility
US 4,855,459 · App. 07/145,795
Process for the production of maleic anhydride
Inventor:
Michael J. Mummey
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Jan 19, 1988
Inventor
Michael J. Mummey
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.