Granted Patent
Utility
US 5,929,154 · App. 08/793,922
Flame retarded polystyrenic resin composition and molded article of a polystyrenic resin
Inventors:
Akitoshi Masuyama, Tohru Iwashita, Shinobu Yamao, Masami Mihara
Patented Case
View Patent ↗
Granted: Jul 27, 1999
Filed: Apr 7, 1997
Inventors
Akitoshi Masuyama
Tohru Iwashita
Shinobu Yamao
Masami Mihara
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.