Granted Patent
Utility
US 4,731,400 · App. 06/808,952
Thermoplastic resin composition
Inventor:
Hiromi Shigemoto
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Dec 16, 1985
Inventor
Hiromi Shigemoto
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.