Granted Patent
Utility
US 5,604,287 · App. 08/545,571
Polyarylene sulfide resin composition
Inventor:
Shinobu Yamao
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Nov 17, 1995
Inventor
Shinobu Yamao
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.