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:
May. 16, 2017
Filed:
Sep. 10, 2013
Ngk Insulators, Ltd., Nagoya-shi, Aichi-Prefecture, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
The invention provides a tunnel kiln for firing ceramic porous bodies which can fire ceramic porous bodies containing organic binders in a shorter period of time than in conventional methods without producing breaks or requiring nitrogen gas. The tunnel kiln includes a preheating zone, a firing zone, and a cooling zoneand fires the ceramic porous bodies loaded on a carriageby driving it in a furnace. A heat storage regenerative burneris used as means of heating the firing zoneso that low-oxygen-concentration exhaust gas discharged from the heat storage regenerative burnermay be returned to an exhaust gas return lineand supplied into the preheating zone. The exhaust gas return linemay be provided with a combustion devicethat reduces the oxygen concentration by consuming oxygen contained in the exhaust gas.