Granted Patent
Utility
US 4,609,634 · App. 06/227,012
High efficiency extraction method for recovering oxidation catalyst material from dimethyl terephthalate esterified oxidate residue and the like
Inventor:
William M. King
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jan 21, 1981
Inventor
William M. King
Assignee (at issue)
American Hoechst 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.