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. 14, 1992
Filed:
Mar. 06, 1990
Applicant:
Inventor:
Hubert Jager, Biberbach-Eisenbrechtshofen, DE;
Assignee:
Sigri GmbH, Meitingen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C10G / ;
U.S. Cl.
CPC ...
208125 ; 208126 ; 208131 ; 208 39 ; 208 44 ; 423448 ; 423449 ;
Abstract
Carbonates, oxides, carbides or fluorides of alkaline earth metals are added to coal tar pitches before coking. After the coking, which is preferably carried out by the delayed coking process, this produces coal tar pitch cokes or coal tar pitch needle cokes which have no irreversible expansion or a strongly reduced irreversible expansion upon heating in the temperature range of 1400.degree. to 2000.degree. C.