Granted Patent
Utility
US 4,492,787 · App. 06/413,159
Process for continuously producing propylene-ethylene block copolymer
Inventors:
Ryokichi Takashima, Nobuaki Goko, Yumito Uehara, Yasuhiro Nishihara, Hidetoshi Yamamoto
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Aug 30, 1982
Inventors
Ryokichi Takashima
Nobuaki Goko
Yumito Uehara
Yasuhiro Nishihara
Hidetoshi Yamamoto
Assignee (at issue)
Mitsubishi Chemical 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.