Granted Patent
Utility
US 6,750,319 · App. 10/117,193
Process for producing polyarylene sulfide and apparatus used therein
Inventor:
Yoshinari Koyama
Patented Case
View Patent ↗
Granted: Jun 15, 2004
Filed: Apr 8, 2002
Inventor
Yoshinari Koyama
Assignees (at issue)
Idemitsu Petrochemical Co., Ltd.
Petroleum Energy Center, A Juridical Incorporated Foundation
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.