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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 10434494 B1

PDFFull Text
Date of Patent:
Oct. 08, 2019

Filed:

Mar. 08, 2016

Filtration material for filtered venting, and filtered venting device

Applicant:

Rasa Industries, Ltd., Tokyo, JP;

Inventors:

Toshiki Kobayashi, Tokyo, JP;

Koji Endo, Tokyo, JP;

Assignee:

Rasa Industries, Ltd., Tokyo, JP;

Attorney:

Renner, Otto, Boisselle & Sklar, LLP

Primary Examiner:

Frank M Lawrence, Jr

Int. Cl.
CPC ...
B01D 53/04 (2006.01); B01J 20/18 (2006.01); B01D 53/68 (2006.01); C01B 39/22 (2006.01); C01B 39/32 (2006.01); G21C 9/004 (2006.01); G21F 9/02 (2006.01); B01J 20/30 (2006.01); C01B 39/02 (2006.01); C01B 39/46 (2006.01); B01J 20/28 (2006.01);
U.S. Cl.
CPC ...
B01J 20/183 (2013.01); B01D 53/04 (2013.01); B01D 53/0407 (2013.01); B01D 53/68 (2013.01); B01J 20/186 (2013.01); B01J 20/28052 (2013.01); B01J 20/3085 (2013.01); C01B 39/026 (2013.01); C01B 39/22 (2013.01); C01B 39/32 (2013.01); C01B 39/46 (2013.01); G21C 9/004 (2013.01); G21F 9/02 (2013.01); B01D 2253/108 (2013.01); B01D 2257/202 (2013.01); B01D 2257/2068 (2013.01);
Abstract

Provided are a filtration material for filtered venting and a filtered venting device that are more effective in adsorbing radioactive iodine than in the conventional art and are useful for addressing severe accidents. The filtration material for filtered venting comprises granulated zeolite L, wherein at least a portion of the ion exchange sites of the zeolite L are substituted with silver. Of the ion exchange sites, a constitution ratio (a/b) of ion exchange sites (a) substituted with silver to ion exchange sites (b) not substituted with silver is 25/75-55/45. The zeolite L has a silver content of 7-12 wt % on a dry weight basis.

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