Granted Patent
Utility
US 4,378,452 · App. 06/269,011
Method of manufacturing rubber modified styrene resins
Inventors:
Mune Iwamoto, Norifumi Ito, Yuzuru Ishida, Tetsuyuki Matsubara
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Jul 1, 1981
Inventors
Mune Iwamoto
Norifumi Ito
Yuzuru Ishida
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.