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:
Nov. 06, 2012
Filed:
Oct. 26, 2006
Masashi Beppu, Osaka, JP;
Shinichi Chikura, Osaka, JP;
Masashi Beppu, Osaka, JP;
Shinichi Chikura, Osaka, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A spiral-type separation membrane element is provided that can reduce the pressure loss without changing the outer diameter and the inner diameter of the water-collecting tube. In a spiral-type separation membrane element in which a separation membrane, a feed-side flow passageway member, and a permeate-side flow passageway member are wound in a spiral form around a porous water-collecting tube in a laminated state, the feed-side flow passageway member includes a net-constituting thread in a direction tilted relative to a feed solution flow direction; the net-constituting thread has a cross-sectional part such that a thread diameter X in a direction parallel to a feed solution flow plane is larger than a thread diameter Y in a direction perpendicular to the feed solution flow plane; and a central part between intersection parts of the net-constituting thread is made to have a thread diameter Y smaller than that of an intersection part.