Granted Patent
Utility
US 4,388,447 · App. 06/323,064
Process for producing rubber modified styrene resins
Inventors:
Mune Iwamoto, Norifumi Ito, Yuzuru Ishida, Yasuo Furuta, Tetsuyuki Matsubara
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Nov 19, 1981
Inventors
Mune Iwamoto
Norifumi Ito
Yuzuru Ishida
Yasuo Furuta
Tetsuyuki Matsubara
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.