The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 1984
Filed:
May. 23, 1983
Applicant:
Inventors:
Martin Bartmann, Recklinghausen, DE;
Hanns-Jorg Bax, Marl, DE;
Klaus Burzin, Marl, DE;
Wilfried Ribbing, Dorsten, DE;
Assignee:
Chemische Werke Huls AG, Marl, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528216 ; 528212 ; 528214 ; 528215 ; 528217 ;
Abstract
A method for producing high molecular-weight polyphenylene oxides which comprises the oxidative coupling of a diortho-substituted phenol in the presence of a copper-amine complex, and an activator of a polyvalent alcohol, an alkali or alkaline earth hydroxide, and, if necessary, the hydrobromide of a secondary amine.