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:
Mar. 31, 1981
Filed:
Feb. 28, 1979
Applicant:
Inventors:
Jurgen Stadelhofer, Dortmund, DE;
Gerd Collin, Duisburg, DE;
Assignee:
Rutgerswerke Aktiengesellschaft, Frankfurt, DE;
Primary Examiner:
Int. Cl.
CPC ...
C10C / ;
U.S. Cl.
CPC ...
208 45 ; 208309 ;
Abstract
Quinoline-insoluble components are separated from coal tar pitch by treating the coal tar pitch which has a softening point of greater than 60.degree. C. (according to the method of Kraemer-Sarnow) with a solvent mixture comprising at least one solvent with paraffinic characteristics and at least one tar solvent, wherein the treatment is carried out at a temperature in the range of 200.degree. to 270.degree. C.