Method for producing high-molecular polyphenylene- oxides
CA 1206693 A · Owner: Degussa-Huls Aktiengesellschaft · Inventors: Ribbing, Wilfried; Bartmann, Martin; Burzin, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for producing high-molecular polyphenylene-oxides by oxidative coupling of a diorthosubstituted phenol in the presence of a copper-amine complex and an activator based upon a multivalent alcohol, an alkaline compound and possibly the hydrobromide of a secondary amine, the method having increased efficiency.
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 June 24, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 2003.
- 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.