Granted Patent
Utility
US 5,191,023 · App. 07/726,951
Block-copolymerized-rubber-modified styrene copolymers
Inventors:
Mune Iwamoto, Norifumi Ito, Tetsuyuki Matsubara, Kazuo Sugazaki, Toshihiko Ando
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jul 8, 1991
Inventors
Mune Iwamoto
Norifumi Ito
Tetsuyuki Matsubara
Kazuo Sugazaki
Toshihiko Ando
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.