Granted Patent
Utility
US 4,239,871 · App. 06/096,420
Process for polymerization of butene
Inventor:
Kunisuke Fukui
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Nov 21, 1979
Inventor
Kunisuke Fukui
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.