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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.:

US 11471834 B1

PDFFull Text
Date of Patent:
Oct. 18, 2022

Filed:

Sep. 04, 2018

Filtration method using porous membrane

Applicant:

Asahi Kasei Kabushiki Kaisha, Tokyo, JP;

Inventor:

Daisuke Okamura, Tokyo, JP;

Assignee:

ASAHI KASEI KABUSHIKI KAISHA, Tokyo, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Jason M Greene

Assistant Examiner:

Eric J McCullough

Int. Cl.
CPC ...
B01D 65/02 (2006.01); B01D 61/02 (2006.01); B01D 61/14 (2006.01); B01D 61/58 (2006.01); B01D 69/08 (2006.01); B01D 71/34 (2006.01); B01D 71/36 (2006.01); C02F 1/44 (2006.01); C08J 9/26 (2006.01); C02F 103/08 (2006.01);
U.S. Cl.
CPC ...
B01D 65/02 (2013.01); B01D 61/025 (2013.01); B01D 61/145 (2013.01); B01D 61/147 (2013.01); B01D 61/58 (2013.01); B01D 69/08 (2013.01); B01D 71/34 (2013.01); B01D 71/36 (2013.01); C02F 1/441 (2013.01); C02F 1/444 (2013.01); C08J 9/26 (2013.01); C02F 2103/08 (2013.01); C02F 2303/16 (2013.01); C08J 2201/044 (2013.01); C08J 2323/08 (2013.01); C08J 2327/12 (2013.01); C08J 2327/16 (2013.01); C08J 2327/18 (2013.01);
Abstract

Provided is a filtration method that includes a cleaning step and involves the use of a porous membrane, wherein the filtration method offers exceptional resistance to cleaning solutions (chemicals) (chemical liquid resistance) and exceptional filtration performance, and has a long service life. A filtration method includes the following steps: a filtration step in which a liquid to be processed that contains a material to be filtered is passed through a porous membrane configured from a resin having a three-dimensional mesh structure, and a filtrate is separated from the material to be filtered; and a cleaning step in which the porous membrane has a cleaning solution passed therethrough or is immersed in the cleaning solution so that the interior of the porous membrane is cleaned.

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