US 4,534,775 A · Air treatment filter element and air treatment filter

Abstract

An air treatment filter element is produced by contacting an adsorbent material selected from zeolite, activated carbon or a combination thereof with a liquid for inhibiting the growth of microorganisms. Additionally, the adsorbent material may include silica gel. Preferably, the liquid includes a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid, at least one polyhydric alcohol, the polyhydric alcohol being present in an amount from about 83 to 99.5% by weight of the liquid, and at least one additional compound for modifying the vapor pressure of the polyhydric alcohol, the additional compound being present in an amount from about 0 to 15% by weight of the liquid. The amount of liquid used is from about 5 to 50%, most preferably 20 to about 30%, by weight of the combined weight of the liquid and adsorbent material.

Claims40

Dependent claims

A method for removing odors and harmful gases from indoor air which comprises contacting the air, odors and harmful gases with an air treatment filter element, said element consisting essentially of at least one layer of an adsorbent material selected from the group consisting of zeolite, activated carbon, silica gel, and a combination thereof, said adsorbent material containing a liquid for inhibiting the growth of microorganisms, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said adsorbent and said liquid;

said liquid comprising:
(a) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid;
(b) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount from about 83 to 99.5% by weight of the liquid;
and
(c) at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid.

2 more elements

A method for removing particulate matter, odors, and harmful gases from indoor air which comprises passing particulate matter, odors, harmful gases and air through an air filter comprising:

(a) a structure for holding a filter element;
and
(b) a filter element consisting essentially of:
(1) a first layer comprising plastic foam;
(2) a second layer adjacent said first layer comprising silica gel containing a liquid for inhibiting the growth of microorganisms, said liquid comprising
(i) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid,
(ii) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount from about 83 to about 99.5% by weight of the liquid,
(iii) at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid, and
(iv) a naringen-iron chelate produced from the reaction of naringen in an amount from about 0.1 to 0.2% by weight of the liquid with ferric chloride hydrate in an amount from about 0.01 to 0.10% by weight of the liquid, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said silica gel and said liquid;
(3) a third layer adjacent said second layer comprising a combination of zeolite and activated carbon, said zeolite and activated carbon containing a liquid for inhibiting the growth of microorganisms, said liquid comprising
(i) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid,
(ii) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount about 83 to 99.5% by weight of the liquid,
(iii) at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid, and
(iv) a naringen-iron chelate produced from the reaction of naringen in an amount from about 0.1 to 0.2% by weight of the liquid with ferric chloride hydrate in any amount from about 0.01 to 0.10% by weight of the liquid, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said zeolite, activated carbon and liquid, and
(4) a fourth layer adjacent said third layer comprising plastic foam.

12 more elements

An air treatment filter comprising:

(a) a structure for holding a filter element;
and
(b) a filter element consisting essentially of:
(1) a first layer comprising silica gel containing a liquid for inhibiting the growth of microorganisms, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said silica gel and said liquid;
and
(2 ) a second layer, said second layer being adjacent to said first layer and comprising a combination of zeolite and activated carbon, said zeolite and activated carbon containing a liquid for inhibiting the growth of microorganisms, said liquid for inhibiting the growth of microorganisms, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said zeolite, activated carbon and liquid;
said first and second layers being positioned between two layers containing material for removing particulate matter from the air, and said liquid of said first and second layers comprising:
(a) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid,
(b) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount from about 83 to about 99.5% by weight of the liquid, and
(c) optionally, at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid.

7 more elements

An air treatment filter comprising:

(a) a structure for holding a filter element;
and
(b) a filter element consisting essentially of:
(1) a first layer comprising plastic foam;
(2) a second layer adjacent said first layer comprising silica gel containing a liquid for inhibiting the growth of microorganisms, said liquid comprising
(i) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid,
(ii) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount from about 83 to about 99.5% by weight of the liquid,
(iii) at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid, and
(iv) a naringen-iron chelate produced from the reaction of naringen in an amount from about 0.1 to 0.2% by weight of the liquid with ferric chloride hydrate in an amount from about 0.01 to 0.10% by weight of the liquid, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said silica gel and said liquid;
(3) a third layer adjacent said second layer comprising a combination of zeolite and activated carbon, said zeolite and activated carbon containing a liquid for inhibiting the growth of microorganisms, said liquid comprising
(i) a fungicide/bacteriocide preservative composition in an amount from about 0.5 to 2% by weight of the liquid,
(ii) at least one polyhydric alcohol, said polyhydric alcohol being present in an amount about 83 to 99.5% by weight of the liquid,
(iii) at least one compound for modifying the vapor pressure of said polyhydric alcohol, said compound being present in an amount of less than about 15% by weight of the liquid, and
(iv) a naringen-iron chelate produced from the reaction of naringen in an amount from about 0.1 to 0.2% by weight of the liquid with ferric chloride hydrate in any amount from about 0.01 to 0.10% by weight of the liquid, said liquid being present in an amount from about 5 to about 50% by weight of the combined weight of said zeolite, activated carbon and liquid, and
(4) a fourth layer adjacent said third layer comprising plastic foam.

12 more elements

Dependencies are inferred from the claim text.

Air treatment filter element and air treatment filter

Life of this patent

Air treatment filter element and air treatment filter

Life of this patent

Abstract

Claims40