Granted Patent
Utility
US 5,565,609 · App. 08/313,184
Method of purifying aromatic dicarboxylic acids
Inventors:
Noriyuki Hirowatari, Hiroyasu Ohno, Kenji Shimamoto
Patented Case
View Patent ↗
Granted: Oct 15, 1996
Filed: Nov 22, 1994
Inventors
Noriyuki Hirowatari
Hiroyasu Ohno
Kenji Shimamoto
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.