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. 04, 2003
Filed:
May. 14, 1998
Richard A. Hayden, Pittsburgh, PA (US);
Calgon Carbon Corporation, Pittsburgh, PA (US);
Abstract
A carbonaceous char is provided having a reduced inherent carbon catalytic activity. The char is derived from one or more of the following: wood, nutshell, fruitstone, peat, lignite, sub-bituminous coal, bituminous coal, semi-anthracite coal, anthracite coal and organic polymers, and has an inherent or “MOD 12” t-¾ time equal to or greater than 125 minutes or a maximum delta T less than or equal to 20° C. The MOD 12 t-¾ time is equal to the elapsed time required for 0.250 grams of said carbonaceous char, pulverized, to decompose from ambient temperature and under adiabatic conditions three-fourths of 0.42 moles of hydrogen peroxide contained in 150 mL of an aqueous solution containing a buffer having a pH of about 12. The maximum delta T is the absolute temperature difference between ambient temperature and the maximum temperature achieved by the hydrogen peroxide decomposition wherein the carbonaceous char has been inertly calcined at temperatures above 700° C. and cooled to ambient temperature under inert conditions prior to measurement of the MOD 12 t-¾ time and the maximum delta T.