Granted Patent
Utility
US 5,034,441 · App. 07/559,971
Styrene-based resin composition and process for producing molding products thereof
Inventors:
Akikazu Nakano, Takashi Sumitomo
Patented Case
View Patent ↗
Granted: Jul 23, 1991
Filed: Jul 27, 1990
Inventors
Akikazu Nakano
Takashi Sumitomo
Assignee (at issue)
IDEMITSU KOSAN CO., 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.