Granted Patent
Utility
US 5,349,013 · App. 08/123,589
Process for production of styrene-based resin composition
Inventors:
Takashi Ashida, Yoshinori Sato
Patented Case
View Patent ↗
Granted: Sep 20, 1994
Filed: Sep 17, 1993
Inventors
Takashi Ashida
Yoshinori Sato
Assignee (at issue)
Idemitsu Petrochemical 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.