Granted Patent
Utility
US 4,954,571 · App. 07/248,951
Rubber dispersed copolymer resin
Inventors:
Mune Iwamoto, Norifumi Ito
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Sep 26, 1988
Inventors
Mune Iwamoto
Norifumi Ito
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.