Granted Patent
Utility
US 5,658,997 · App. 08/474,658
Process for polymerizing propylene by using a novel metallocene catalyst
Inventors:
Daisuke Fukuoka, Takashi Tashiro, Koji Kawaai, Junji Saito, Takashi Ueda, Yoshihisa Kiso, Junichi Imuta, Terunori Fujita, Masatoshi Nitabaru, Masayasu Yoshida
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Jun 7, 1995
Inventors
Daisuke Fukuoka
Takashi Tashiro
Koji Kawaai
Junji Saito
Takashi Ueda
Yoshihisa Kiso
Junichi Imuta
Terunori Fujita
Masatoshi Nitabaru
Masayasu Yoshida
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.