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. 21, 1978
Filed:
Apr. 28, 1977
Kosaku Noguchi, Tokyo, JA;
Kiyoharu Yoshimura, Izumi, JA;
Honami Tanaki, Isumi, JA;
Reijiro Nishiyama, Izumi, JA;
Akio Mimura, Izumi, JA;
Jousuke Sato, Tanashi, JA;
Kiyohiko Koizumi, Tokyo, JA;
Koa Oil Company, Ltd., Tokyo, JA;
Abstract
Pitch is produced continuously by heat treating a heavy hydrocarbon oil at a temperature of 350.degree. to 500.degree. C successively in two or more reactors connected in series, outlet to inlet, recirculating, at the same time, one portion of the liquid output substance from at least one reactor into that reactor, and introducing the output substance (molten pitch) of the final reactor into an after-treatment chamber of duct shape with an inactive atmosphere sealed therewithin thereby to cool the output substance.