Granted Patent
Utility
US 5,898,061 · App. 08/980,119
Continuous process for producing polyarylene sulfide
Inventors:
Kiyoshi Sase, Yoshinari Koyama, Masao Oomori
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Nov 26, 1997
Inventors
Kiyoshi Sase
Yoshinari Koyama
Masao Oomori
Assignees (at issue)
Idemitsu Petrochemical Co., Ltd.
PETROLEUM ENERGY CENTER
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.