Granted Patent
Utility
US 4,490,508 · App. 06/480,349
Graft-modified copolymer and compounding agent for styrene-type polymer containing the same
Inventors:
Riichiro Nagano, Toshihiro Sagane
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Mar 30, 1983
Inventors
Riichiro Nagano
Toshihiro Sagane
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.