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:
Jan. 22, 1980
Filed:
May. 05, 1978
Applicant:
Inventors:
Derek J Angier, Peapack, NJ (US);
Harry W Barnum, Brookside, NJ (US);
Assignee:
Exxon Research & Engineering Co., Florham Park, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10C / ; C10C / ; D01F / ;
U.S. Cl.
CPC ...
208 44 ; 208 22 ; 208 45 ; 4234471 ; 4234474 ; 423449 ;
Abstract
A process for increasing that fraction of an isotropic carbonaceous pitch which is capable of being thermally converted to an optically anisotropic carbonaceous pitch having less than 25 wt. % quinoline insolubles is described. Basically, the pitch is heated at elevated temperatures until spherules visible under polarized light begin to appear. Then heating is terminated and the pitch solvent extracted to provide a solvent insoluble fraction which is capable of being thermally converted to the optically anisotropic pitch.