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, 1982
Filed:
Oct. 15, 1980
NGK Insulators, Ltd., Nagoya, JP;
Abstract
The disclosed ceramic honeycomb filter comprises a ceramic honeycomb structural body having a multiplicity of parallel channels extending therethrough, selected channels being sealed at one ends thereof while the remainder of the channels being sealed at opposite ends thereof in such a manner that, as dust-containing gas flows therethrough from said one ends to said opposite ends, the gas passes through walls between adjacent channels where the dust particles are collected. The ceramic honeycomb structural body has a coefficient of thermal expansion .alpha..sub.A of 0 to 8.0.times.10.sup.-6 /.degree.C. for 40.degree. C. to 800.degree. C., and the sealing material of the channels at said ends thereof has a coefficient of thermal expansion .alpha..sub.B which is in the following range for 40.degree. C. to 800.degree. C. The relationship of the coefficients of thermal expansion .alpha..sub.A and .alpha..sub.B are such that .vertline..alpha..sub.A -.alpha..sub.B .vertline..ltoreq.3.5.times.10.sup.-6 /.degree.C., and preferably .vertline..alpha..sub.A -.alpha..sub.B .vertline..ltoreq.2.5.times.10.sup.-6 /.degree.C.