Granted Patent
Utility
US 4,895,978 · App. 06/864,813
Oxidation of pseudocumene to trimellitic acid enhanced by low gram atom ratios of zirconium to transition metal in oxidation catalyst system
Inventors:
John K. Darin, Alan G. Bemis
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: May 19, 1986
Inventors
John K. Darin
Alan G. Bemis
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.