Granted Patent
Utility
US 5,180,849 · App. 07/725,426
Process for producing purified terephthalic acid
Inventor:
Norio Taniguchi
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Jul 3, 1991
Inventor
Norio Taniguchi
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.