Granted Patent
Utility
US 5,698,652 · App. 08/676,229
Styrenic polymer and molded article
Inventors:
Takuma Aoyama, Takaaki Uchida, Akitoshi Masuyama, Komei Yamasaki
Patented Case
View Patent ↗
Granted: Dec 16, 1997
Filed: Jul 24, 1996
Inventors
Takuma Aoyama
Takaaki Uchida
Akitoshi Masuyama
Komei Yamasaki
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.