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. 09, 1999
Filed:
Mar. 25, 1996
Applicant:
Inventors:
David J Kaul, Acton, MA (US);
William L Sifleet, Acton, MA (US);
Gregory T Gaudet, Acton, MA (US);
William M Porteous, Amerillo, TX (US);
Allan C Morgan, Manchester-by-the-Sea, MA (US);
Assignee:
Cabot Corporation, Boston, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
4234491 ; 423450 ;
Abstract
A method for increasing the aggregate size and structure of carbon blacks produced by a furnace carbon black reactor by lowering the temperature of, but not stopping pyrolysis in, the effluent (the mixture of combustion gases and feedstock in which pyrolysis is occurring), preferably up to about 800 degrees F., at a residence time between about 0.0 second and about 0.002 second downstream from the furthest downstream point of injection of feedstock.