Granted Patent
Utility
US 4,755,622 · App. 06/734,570
Process for the production of trimellitic acid and pyromellitic acid by staged bromine addition in an oxidation of polyalkylaromatics
Inventors:
Wayne P. Schammel, John K. Darin
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: May 15, 1985
Inventors
Wayne P. Schammel
John K. Darin
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.