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:
Jul. 19, 1977
Filed:
Jul. 06, 1976
Applicant:
Inventors:
Tsuyoshi Majima, Toyokawa, JA;
Katsunosuke Hara, Kariya, JA;
Assignee:
NGK Insulators, Ltd., Nagoya, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02C / ;
U.S. Cl.
CPC ...
210 / ; 210 71 ;
Abstract
A pyrolysis process for treating sewage sludge containing chromium by burning combustible gas produced by thermal decomposition of the sewage sludge in a pyrolysis furnace by supplying oxygen of less than the theoretical amount necessary for burning the sewage sludge and keeping a partial pressure of oxygen in the furnace substantially at zero reduces the amount of hexavalent chromium remaining in the pyrolyzed residue to a harmless degree, and does not pollute the environment, has a large treating capacity, and is small in the necessary amount of fuel.