Granted Patent
Utility
US 4,366,123 · App. 06/304,081
Anchor agitator for gaseous phase polymerization vessel
Inventors:
Akifumi Kato, Nobuhiko Kaneshige, Ryoichi Yamamoto
Patented Case
View Patent ↗
Granted: Dec 28, 1982
Filed: Sep 21, 1981
Inventors
Akifumi Kato
Nobuhiko Kaneshige
Ryoichi Yamamoto
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.