Granted Patent
Utility
US 4,501,884 · App. 06/546,883
Process for the production of optionally branched polyarylene sulphide with piperazinone solvent
Inventors:
Edgar Ostlinning, Karsten-Josef Idel
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Oct 31, 1983
Inventors
Edgar Ostlinning
Karsten-Josef Idel
Assignee (at issue)
Bayer Aktiengesellschaft
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.