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:
Aug. 30, 1977
Filed:
Oct. 25, 1974
Applicant:
Inventors:
Assignees:
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JA;
Toyo Boseki Kabushiki Kaisha, Osaka, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
252421 ; 252422 ; 252426 ; 252438 ; 252444 ; 252445 ;
Abstract
Microporous pitch spheres prepared from pitch are oxidized at a temperature of from 100.degree. C to 500.degree. C in an atmosphere of an oxidative gas to produce pitch spheres containing not less than 10% by weight of combined oxygen. Then the combined oxygen-containing pitch spheres are heated at a temperature of from 150.degree. C to 700.degree. C in an atmosphere of ammonia gas to produce pitch spheres containing not less than 1.5% by weight combined nitrogen. The resultant pitch spheres are subsequently activated by a conventional method to produce activated carbon spheres containing more than 1% by weight of combined nitrogen.