Granted Patent
Utility
US 5,985,973 · App. 08/908,665
Polypropylene-based resins and polypropylene-based resin compositions
Inventors:
Takashi Sumitomo, Masaru Nakagawa, Masatoshi Toda, Yutaka Kobayashi, Motoki Yamada
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Aug 6, 1997
Inventors
Takashi Sumitomo
Masaru Nakagawa
Masatoshi Toda
Yutaka Kobayashi
Motoki Yamada
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.