Granted Patent
Utility
US 4,808,667 · App. 07/075,619
Method for producing an .alpha.-olefin block copolymer
Inventors:
Nobuaki Goko, Yumito Uehara, Yasuhiro Nishihara
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jul 20, 1987
Inventors
Nobuaki Goko
Yumito Uehara
Yasuhiro Nishihara
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.