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:
Feb. 21, 1978
Filed:
Apr. 30, 1976
Applicant:
Inventor:
Paul H Johnson, Bartlesville, OK (US);
Assignee:
Phillips Petroleum Company, Bartlesville, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08K / ;
U.S. Cl.
CPC ...
260 4247 ; 260 4248 ; 423445 ; 423450 ; 423460 ;
Abstract
A non-carcinogenic normal cure carbon black is produced by severely aftertreating a carbon black-containing smoke to result in a carbon black with a photelometer of 100% and a pitting value of about 15 m.sup.2 /g or more in case of small particle carbon black (CTAB of 120 m.sup.2 /g) and of 0.2 m.sup.2 /g or more in case of large particle carbon black (CTAB of 30 m.sup.2 /g) by contacting the carbon black with an oxidizing agent, by high temperature drying the carbon black at a temperature of about 500 to about 600.degree. F and finally by aftertreating the dried carbon black at a high temperature of about 1,000 to 1,400.degree. F.