Granted Patent
Utility
US 5,856,433 · App. 08/835,801
Apparatus for manufacturing polyarylene sulfide and process for manufacturing polyarlene sulfide using the apparatus
Inventors:
Yoshinari Koyama, Kiyoshi Sase
Patented Case
View Patent ↗
Granted: Jan 5, 1999
Filed: Apr 16, 1997
Inventors
Yoshinari Koyama
Kiyoshi Sase
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.