Granted Patent
Utility
US 4,619,959 · App. 06/737,531
Continuous production process of styrene-base resin
Inventors:
Tetsuyuki Matsubara, Norifumi Ito, Kazuo Sugazaki, Kouzo Ichikawa, Mune Iwamoto, Toshihiko Ando
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: May 24, 1985
Inventors
Tetsuyuki Matsubara
Norifumi Ito
Kazuo Sugazaki
Kouzo Ichikawa
Mune Iwamoto
Toshihiko Ando
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
TOYO ENGINEERING CORPORATION
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.