Process for the preparation of high molecular weight, optionally branched polyarylene sulphides
CA 1248689 A · Owner: Bayer Aktiengesellschaft · Inventors: Idel, Karsten; Ostlinning, Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of high molecular weight optionally branched polyarylene sulphides A b s t r a c t, This invention relates to a process for the preparation of high molecular weight, optionally branched polyarylene sulphides. These may be prepared from alkali metal sulphides and aromatic halogen compounds in a polar organic solvent in the absence of water.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.