BROAD SPECTRUM FILTER SYSTEM INCLUDING TUNGSTEN-BASED IMPREGNANT AND BEING USEFUL FOR FILTERING CONTAMINANTS FROM AIR OR OTHER GASES

Title:

BROAD SPECTRUM FILTER SYSTEM INCLUDING TUNGSTEN-BASED IMPREGNANT AND BEING USEFUL FOR FILTERING CONTAMINANTS FROM AIR OR OTHER GASES

Document Type and Number:

WIPO Patent Application WO2005005020

Kind Code:

A3

Abstract:

Filter systems that are effective against a broad range of contaminants including HCN, cyanogen chloride (CK), acid contaminants. and basic contaminants such as ammonia without the need (but with the option, if desired) for using molybdenum or chromium containing materials. The filtering systems of the present invention include a tungsten-based material and other impregnants incorporated into a substrate such as filter media particles.

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Inventors:

BREY LARRY A
SMITH SIMON J
WEAGLE GLENN E

Application Number:

PCT/US2004/016756

Publication Date:

April 07, 2005

Filing Date:

May 27, 2004

Export Citation:

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Assignee:

3M INNOVATIVE PROPERTIES CO (US)

International Classes:

B01D53/04; B01D53/38; B01J20/20; B01J20/32; (IPC1-7): B01D53/04; B01J20/20

Domestic Patent References:

WO1993010896A1

1993-06-10

Foreign References:

US5113856A	1992-05-19
US2920051A	1960-01-05
US0293962A	1884-02-19
EP0370141A1	1990-05-30
US5714126A	1998-02-03
EP0405404A1	1991-01-02

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