Granted Patent
Utility
US 5,635,587 · App. 08/357,405
Process for manufacturing polyarylene sulfide
Inventors:
Yoshinari Koyama, Norio Ogata, Hiroshi Nishitani
Patented Case
View Patent ↗
Granted: Jun 3, 1997
Filed: Dec 16, 1994
Inventors
Yoshinari Koyama
Norio Ogata
Hiroshi Nishitani
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.