Granted Patent
Utility
US 6,313,227 · App. 09/722,005
Propylene-ethylene block copolymer, resin composition, and blow-molded article
Inventors:
Kenji Tanaka, Yasuhisa Sugita, Masaru Nakagawa, Tetsuya Nakamura
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Nov 27, 2000
Inventors
Kenji Tanaka
Yasuhisa Sugita
Masaru Nakagawa
Tetsuya Nakamura
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.