Salt-tolerant, water absorbing filter

Details Salt-tolerant, water absorbing filter Salt-tolerant, water absorbing filter

2006-02-14

2006-02-14

Cintins, Ivars C. (Department: 1724)

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

C210S497010, C210S502100, C210S505000

Reexamination Certificate

active

06997327

ABSTRACT:
A filter comprises a paper layer, at least one outer particle filtering layer adjacent the paper layer, an ion exchange layer adjacent the at least one outer particle filtering layer, at least one outer non-woven layer adjacent the ion exchange layer, at least one salt-tolerant superabsorbant polymer layer adjacent the at least one outer non-woven layer, an inner particle filtering layer adjacent the at least one salt-tolerant superabsorbant polymer layer, an inner non-woven layer adjacent the inner particle filtering layer, and a support adjacent the inner non-woven layer.Alternatively, the filter comprises a paper layer, at least one outer particle filtering layer adjacent the paper layer, at least one salt-tolerant superabsorbant polymer layer adjacent the at least one outer particle filtering layer, an inner particle filtering layer adjacent the at least one salt-tolerant superabsorbant polymer layer, an inner non-woven layer adjacent the inner particle filtering layer, and a support adjacent the inner non-woven layer.

REFERENCES:
patent: 3262578 (1966-07-01), Dennis
patent: 4048075 (1977-09-01), Colvin et al.
patent: 4787949 (1988-11-01), Cole et al.
patent: 5122270 (1992-06-01), Ruger et al.
patent: 5274018 (1993-12-01), Tanaka et al.
patent: 5669894 (1997-09-01), Goldman et al.
patent: 6380456 (2002-04-01), Goldman
patent: 6603055 (2003-08-01), Mitchell et al.
patent: WO 96/15162 (1996-05-01), None
patent: WO 96/17681 (1996-06-01), None

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