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. 29, 1980
Filed:
Jun. 05, 1978
Applicant:
Inventors:
Gerd Blinne, Bobenheim, DE;
Claus Cordes, Weisenheim, DE;
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528174 ;
Abstract
Polyethers, preferably containing sulfone groups, are obtained by a multi-stage condensation process at from 100.degree. to 230.degree. C. from substantially equivalent amounts of bis-(4-hydroxyphenyl)-sulfone and a dichlorobenzene compound in a polar aprotic solvent in the presence of an anhydrous alkali metal carbonate, with or without the addition of a compound which forms an azeotrope.
Blinne, Gerd. (1980). Manufacture of polyethers from bis-(4-hydroxyphenyl)-sulfone and (U.S. Patent No. 4200728). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4200728
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile