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:
Oct. 18, 1988
Filed:
Apr. 22, 1987
Applicant:
Inventors:
Franz-Michael Bollenrath, Marl, DE;
Martin Bartmann, Recklinghausen, DE;
Assignee:
Huls Aktiengesellschaft, Marl, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
436128 ; 528212 ; 436 52 ;
Abstract
A method of continuous rapid determination of the J-value during the oxidative coupling reaction of phenols to form polyphenylene ethers. Solution of a defined temperature is withdrawn from the reaction mixture, the viscosity of the solution is measured in a Couette viscometer, and the J-value is determined using a calibration curve or mathematical means.