Granted Patent
Utility
US 4,810,773 · App. 06/894,369
Method for producing polyarylene sulfide with lithium halide catalyst
Inventors:
Norio Ogata, Hiroyasu Yamato, Minoru Senga
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Aug 5, 1986
Inventors
Norio Ogata
Hiroyasu Yamato
Minoru Senga
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.