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. 24, 1988
Filed:
Apr. 16, 1986
Tadanori Komoda, Toyoake, JP;
NGK Insulators, Ltd., , JP;
Abstract
A porous ceramic filter consisting of a planar porous support formed of a ceramic material, and a filtering layer formed of a fired mass of a ceramic powder integrally deposited on an upper surface of the porous ceramic support. A particle size of the ceramic powder, and a size of macro pores formed in the fired mass of said ceramic powder, decrease substantially continuously in a direction from the upper surface of the ceramic support toward an exposed surface of the filtering layer. The porous ceramic filter is produced by a process including preparing a suspension containing a ceramic powder of a predetermined particle size distribution; holding the porous support stationary such that the upper surface extends substantially horizontally, and is in contact with the suspension, until particles of the ceramic powder are sedimented by gravity and thereby deposited on the upper surface of the porous support, as an unfired layer for the filtering layer; removing aqueous components from said porous ceramic support and the unfired layer of the deposited particles; and firing the porous ceramic support and the unfired layer to produce the porous ceramic layer.