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:
Dec. 21, 1999
Filed:
Aug. 20, 1998
Yasuhiro Ito, Nagoya, JP;
Wataru Kotani, Kasugai, JP;
NGK Insulators, Ltd., , JP;
Abstract
A method of firing ceramic honeycomb structural bodies, in which cordierite raw materials including at least raw kaolin is extruded to obtain a honeycomb structural formed body and the thus obtained honeycomb structural formed body is fired. The method includes the step of firing a honeycomb structural body having a rib thickness of not more than 4.6 mil under such a condition that a temperature ascending rate during 400-600.degree. C. is maintained under 70.degree. C./hr. As a preferred embodiment, a temperature ascending rate during 400-600.degree. C. is defined as under 70.degree. C./hr in the case of manufacturing a honeycomb structural body having a rib thickness of 4.6-4.0 mil, or, a temperature ascending rate during 400-600.degree. C. is defined as under 40.degree. C./hr in the case of manufacturing a honeycomb structural body having a rib thickness of 3.9-2.0 mil.