Granted Patent
Utility
US 6,001,933 · App. 08/991,536
Flexible polypropylene resins, propylene based elastomer compositions and process for production of olefin polymers
Inventors:
Masayuki Tsuruoka, Rikuo Onishi, Hideo Kusuyama, Akinobu Sugahara
Patented Case
View Patent ↗
Granted: Dec 14, 1999
Filed: Dec 16, 1997
Inventors
Masayuki Tsuruoka
Rikuo Onishi
Hideo Kusuyama
Akinobu Sugahara
Assignee (at issue)
Idemitsu Petrochemical Co., 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.