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:
Sep. 13, 1988
Filed:
Jun. 08, 1987
Kazutaka Mori, Kanonshin, JP;
Kikuji Tsuneyoshi, Kanonshin, JP;
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A process for preparing a porous ceramic membrane to be employed for separating condensible gases and so on, which process comprises disposing on a porous ceramic substrate a layer of alumina sol formed by hydrolyzing an alcoholate or a chelate of aluminum, with subsequent drying and burning thereof, impregnating the resulting burnt body with a solution of an alcoholate or a chelate of aluminum in an organic solvent and subjecting then the aluminum alcoholate or chelate soaked in the burnt body to hydrolysis in a heated steam to cause conversion thereof into alumina sol, immersing the so treated body in an aqueous solution of sodium silicate, followed by, a heat treatment thereof in steam, after the body has been removed from the solution repeating the foregoing procedures until the capillary pores in the substrate would have sufficiently been filled by the alumina sol, immersing the so treated body finally in an aqeous solution of sodium silicate, followed by, a further heat treatment thereof in a steam after the body has been removed from the solution and subsequent subjecting the body to a hot water rinse to remove occluded sodium ions before drying the body.