Granted Patent
Utility
US 6,562,900 · App. 09/895,315
Production process for polyarylene sulfide
Inventors:
Masaya Okamoto, Minoru Senga, Toru Bando
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Jul 2, 2001
Inventors
Masaya Okamoto
Minoru Senga
Toru Bando
Assignees (at issue)
PETROLEUM ENERGY CENTER
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.