Granted Patent
Utility
US 6,420,021 · App. 09/717,223
Propylenic copolymer, and its film
Inventors:
Yasushi Seta, Satoshi Nakatsuka, Michihiro Sawada, Ryoichi Tsunori, Tokutaro Kimura, Yutaka Minami
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Nov 22, 2000
Inventors
Yasushi Seta
Satoshi Nakatsuka
Michihiro Sawada
Ryoichi Tsunori
Tokutaro Kimura
Yutaka Minami
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.