Granted Patent
Utility
US 5,463,113 · App. 08/204,435
Process and apparatus for producing terephthalic acid
Inventors:
Ryoichi Yamamoto, Fujimasa Nakao, Etsurou Okamoto, Yasuhiko Yagi
Patented Case
View Patent ↗
Granted: Oct 31, 1995
Filed: Mar 2, 1994
Inventors
Ryoichi Yamamoto
Fujimasa Nakao
Etsurou Okamoto
Yasuhiko Yagi
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.