Granted Patent
Utility
US 5,008,450 · App. 07/449,047
Process for exchanging dispersing medium of terephthalic acid slurry
Inventors:
Ryoichi Yamamoto, Hiroshi Suzuki
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Dec 14, 1989
Inventors
Ryoichi Yamamoto
Hiroshi Suzuki
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.