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:
Mar. 12, 2002
Filed:
Jul. 19, 2000
Hideomi Ishibe, Hirakata, JP;
Nippon Seisen Co., Ltd., Osaka-fu, JP;
Abstract
It is a metal filter including a fine filtering layer and a supporting member sintered to be porous and having a covering surface to integrate the fine filtering layer into a laminate to maintain its shape. The average pore diameter of the fine filtering layer is set to be smaller than an average pore diameter of the supporting member . The covering surface is formed in an uneven shape so as to allow a filtering surface of the fine filtering layer to be an undulating filtering surface A such that the area ratio S /S of its real filtration area S to the standard filtration area S of the case where it is not formed in an uneven shape, is larger than or equal to 1.3. The average thickness of the fine filtering layer at valley portions of the uneven shape is set to be larger than the average thickness of the fine filtering layer at the crest portions of the uneven shape, and the undulating filtering surface A is formed in a smoothly curved surface shape.