Granted Patent
Utility
US 4,764,639 · App. 06/801,564
Process for the production of trimellitic acid
Inventor:
Wayne P. Schammel
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Nov 25, 1985
Inventor
Wayne P. Schammel
Assignee (at issue)
Amoco Corporation
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.