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:
Jan. 12, 1988
Filed:
Apr. 09, 1986
Tadanori Komoda, Toyoake, JP;
NGK Insulators, Ltd., , JP;
Abstract
A process of producing a multiple-layer filter medium comprising a porous support and a filtering layer formed on one of opposite surfaces of the porous support. The process includes the steps of: immersing the porous support in a liquid, to fill pores in the porous support with the liquid and thereby remove a gas from the pores; preparing a suspension containing particles to form the filtering layer; disposing the porous support such that the above-indicated one surface is exposed to a flow of the suspension, and partially defines a conduit through which the suspension flows; holding the other surface of the porous support under a first pressure lower than a second pressure acting on the above-indicated one surface, and effecting the flow of the suspension in contact with the above one surface for a predetermined time, to permit the particles in the flow to be deposited on the above one surface, thereby forming the filtering layer; draining the conduit of the suspension, and introducing into the conduit a gas having a third pressure higher than the first pressure, and to thereby remove aqueous components from the porous support and the filtering layer; and firing the porous support and the filtering layer.