US4534775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air treatment filter element and air treatment filter
Assignee: Waterbury Companies Inc
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Filing: 1984-04-19
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Granted: 1985-08-13
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Expires: 2004-04-19
Abstract
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.
Inventors
- 👤 Stephen E. Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/106; B01D2253/108; B01D2257/00; B01D2257/90; B01D2259/00; B01D2259/40; B01D2259/414; B01D2259/4141; B01D2259/4145; B01D2259/4146
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
168 words
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.
Claim 2
Independent Claim
168 words
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.
Claim 3
Dependent Claim
12 words
The method according to claim 1 wherein said harmful gas is formaldehyde.
Claim 4
Dependent Claim
33 words
The method according to claim 1 wherein said absorbent material is distributed in at least two adjacent layers with at least one layer containing zeolite and at least one layer containing activated carbon.
Claim 5
Independent Claim
114 words
A method for removing odors and gases from indoor air which comprises contacting the air, odors, and harmful gases with an air treatment filter 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; said liquid comprising the product obtained by contacting grapefruit pulp with a non-toxic polyhydric alcohol to form a reaction product, and separating said reaction product from the pulp residue.
Claim 6
Independent Claim
114 words
A method for removing odors and gases from indoor air which comprises contacting the air, odors, and harmful gases with an air treatment filter 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; said liquid comprising the product obtained by contacting grapefruit pulp with a non-toxic polyhydric alcohol to form a reaction product, and separating said reaction product from the pulp residue.
Claim 7
Dependent Claim
12 words
The method according to claim 4 wherein said harmful gas is formaldehyde.
Claim 8
Independent Claim
262 words
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 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.
Claim 9
Independent Claim
262 words
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 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.
Claim 10
Dependent Claim
12 words
The method according to claim 6 wherein said harmful gas is formaldehyde.
Claim 11
Independent Claim
399 words
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.
Claim 12
Independent Claim
399 words
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.
Claim 13
Dependent Claim
12 words
The method according to claim 8 wherein said harmful gas is formaldehyde.
Claim 14
Independent Claim
193 words
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) first and third layers comprising plastic foam, and (2) a second layer between said first and third layers comprising a combination of silica gel, zeolite and activated carbon, said silica gel, zeolite and activated carbon 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, zeolite, activated carbon and liquid, said liquid comprising: (i) a fungicide/bacteriocide preservation composition in an amount from 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 99.5% by weight of the liquid, and (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.
Claim 15
Independent Claim
193 words
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) first and third layers comprising plastic foam, and (2) a second layer between said first and third layers comprising a combination of silica gel, zeolite and activated carbon, said silica gel, zeolite and activated carbon 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, zeolite, activated carbon and liquid, said liquid comprising: (i) a fungicide/bacteriocide preservation composition in an amount from 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 99.5% by weight of the liquid, and (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.
Claim 16
Dependent Claim
12 words
The method according to claim 10 wherein said harmful gas is formaldehyde.
Claim 17
Dependent Claim
140 words
An air treatment filter element consisting essentially of an adsorbent material selected from the group consisting of zeolite, activated carbon and a combination thereof, said adsorbent material containing a liquid for inhibiting the growth of microorganisms, 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 additional compound for modifying the vapor pressure of said polyhydric alcohol, said additional compound being present in an amount from about 0 to 15% 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 adsorbent and said liquid.
Claim 18
Dependent Claim
140 words
An air treatment filter element consisting essentially of an adsorbent material selected from the group consisting of zeolite, activated carbon and a combination thereof, said adsorbent material containing a liquid for inhibiting the growth of microorganisms, 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 additional compound for modifying the vapor pressure of said polyhydric alcohol, said additional compound being present in an amount from about 0 to 15% 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 adsorbent and said liquid.
Claim 19
Dependent Claim
12 words
The filter element of claim 12 wherein said zeolite is zeolite X.
Claim 20
Dependent Claim
30 words
The filter element of claim 13 wherein said fungicide/bacteriocide preservative composition is selected from the group consisting of: (a) captan, (b) quaternary ammonium cosmetic preservatives, (c) parabens, and (d) iodophors.
Claim 21
Dependent Claim
13 words
The filter element of claim 14 wherein said polyhydric alcohol is propylene glycol.
Claim 22
Dependent Claim
50 words
The filter element of claim 15 wherein said liquid further includes 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 an iron salt in an amount from about 0.01 to 0.10% by weight of the liquid.
Claim 23
Dependent Claim
14 words
The filter element of claim 16 wherein said iron salt is ferric chloride hydrate.
Claim 24
Dependent Claim
28 words
The filter element of claim 17 wherein said polyhydric alcohol is a combination of propylene glycol, glycerin and tripropylene glycol and further wherein said additional compound is water.
Claim 25
Dependent Claim
24 words
The filter element of claim 18, wherein said fungicide/bacteriocide preservative composition is present in an amount of about 1% by weight of said liquid.
Claim 26
Dependent Claim
44 words
The filter element of claim 19 further containing a separate layer comprising activated carbon and silica gel, said activated carbon containing a liquid for inhibiting the growth of microorganisms, wherein said liquid contains an oxidizing agent, said oxidizing agent being compatible with said liquid.
Claim 27
Dependent Claim
45 words
The filter element of claim 12, wherein said adsorbent material is activated carbon or a combination of zeolite and activated carbon, wherein said filter element further includes silica gel and wherein said liquid contains an oxidizing agent, said oxidizing agent being compatible with said liquid.
Claim 28
Dependent Claim
90 words
An air treatment filter element consisting essentially of an adsorbent material selected from the group consisting of zeolite, activated carbon and a combination thereof, said adsorbent material containing a liquid for inhibiting the growth of microorganisms, said liquid comprising the product obtained by contacting grapefruit pulp with a non-toxic polyhydric alcohol to form a reaction product, and separating said reaction product from the pulp residue, 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.
Claim 29
Dependent Claim
90 words
An air treatment filter element consisting essentially of an adsorbent material selected from the group consisting of zeolite, activated carbon and a combination thereof, said adsorbent material containing a liquid for inhibiting the growth of microorganisms, said liquid comprising the product obtained by contacting grapefruit pulp with a non-toxic polyhydric alcohol to form a reaction product, and separating said reaction product from the pulp residue, 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.
Claim 30
Dependent Claim
26 words
The filter element of claim 22 wherein said adsorbent material further includes silica gel, said silica gel containing a liquid for inhibiting the growth of microorganisms.
Claim 31
Dependent Claim
18 words
The filter element of claim 23, wherein said adsorbent material is distributed in at least two adjacent layers.
Claim 32
Dependent Claim
29 words
The filter element of claim 24, wherein one of said layers of said adsorbent material contains zeolite and another of said layers of said adsorbent material contains activated carbon.
Claim 33
Dependent Claim
34 words
The filter element of claim 24, wherein at least one of said layers of adsorbent material comprises a material selected from the group consisting of zeolite, activated carbon, silica gel and a combination thereof.
Claim 34
Dependent Claim
240 words
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.
Claim 35
Dependent Claim
240 words
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.
Claim 36
Dependent Claim
20 words
The air treatment filter of claim 27, wherein said two layers containing material for removing particulate matter comprise plastic foam.
Claim 37
Dependent Claim
178 words
The filter of claim 28, wherein said fungicide/bacteriocide preservative composition in said first layer and said second layer is captan, said captan being present in an amount of 1% by weight of the liquid, wherein said polyhydric alcohol in said first layer and said second layer is a combination of propylene glycol, said propylene glycol being present in an amount from about 74 to 89% by weight of the liquid, and glycerin, said glycerin being present in an amount from about 5 to 10% by weight of the liquid, wherein said additional compound in said first layer and said second layer is water, said water being present in an amount from about 5 to 15% by weight of the liquid, wherein said liquid in said first layer is present in an amount of about 50% by weight of the combined weight of said liquid and said silica gel, and wherein said liquid in said second layer is present in an amount of about 30% by weight of the combined weight of said said liquid, zeolite and activated carbon.
Claim 38
Dependent Claim
16 words
The filter of claim 29, wherein said plastic foam is polyurethane containing 20 pores per inch.
Claim 39
Dependent Claim
13 words
The air treatment filter of claim 30 wherein said zeolite is zeolite X.
Claim 40
Dependent Claim
376 words
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.
Claim 41
Dependent Claim
376 words
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.
Claim 42
Dependent Claim
218 words
The filter of claim 32, wherein said plastic foam is polyurethane, wherein said fungicide/bacteriocide preservative composition in said second layer and said third layer is captan, said captan being present in an amount of about 1% by weight of said liquid, wherein said polyhydric alcohol in said second layer and said third layer is a combination of propylene glycol, said propylene glycol being present in an amount of about 80.5% by weight of said liquid, and glycerin, said glycerin being present in an amount of about 8.5% by weight of said liquid, wherein said at least one additional compound in said second layer and said third layer is water, said water being present in an amount of about 10% by weight of said liquid, wherein said naringin-iron chelate is produced from the reaction of naringin in an amount of 0.175% by weight of the liquid with ferric chloride hydrate in an amount of 0.05% by weight of the liquid, and further wherein said liquid in said second layer is present in an amount of about 50% by weight of the combined weight of said liquid and said silica gel and wherein said liquid in said third layer is present in an amount of about 30% by weight of the combined weight of said liquid, zeolite and activated carbon.
Claim 43
Dependent Claim
13 words
The filter of claim 33 wherein said polyurethane contains 20 pores per inch.
Claim 44
Dependent Claim
13 words
The air treatment filter of claim 34 wherein said zeolite is zeolite X.
Claim 45
Dependent Claim
12 words
The air treatment filter of claim 35 wherein said structure is plastic.
Claim 46
Dependent Claim
170 words
An air treatment filter comprising: (a) a structure for holding a filter element; and (b) a filter element consisting essentially of: (1) first and third layers comprising plastic foam, and (2) a second layer between said first and third layers comprising a combination of silica gel, zeolite and activated carbon, said silica gel, zeolite and activated carbon 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, zeolite, activated carbon and liquid, said liquid comprising: (i) a fungicide/bacteriocide preservation composition in an amount from 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 99.5% by weight of the liquid, and (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.
Claim 47
Dependent Claim
170 words
An air treatment filter comprising: (a) a structure for holding a filter element; and (b) a filter element consisting essentially of: (1) first and third layers comprising plastic foam, and (2) a second layer between said first and third layers comprising a combination of silica gel, zeolite and activated carbon, said silica gel, zeolite and activated carbon 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, zeolite, activated carbon and liquid, said liquid comprising: (i) a fungicide/bacteriocide preservation composition in an amount from 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 99.5% by weight of the liquid, and (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.
Claim 48
Dependent Claim
114 words
The air treatment filter of claim 37 wherein said fungicide/bacteriocide preservative composition is captan, said captan being present in an amount of 1% by weight of said liquid, wherein said polyhydric alcohol is a combination of propylene glycol, said propylene glycol being present in amount of about 80.5% by weight of said liquid, and glycerin, said glycerin being present in amount of about 8.5% by weight of said liquid, wherein said additional compound is water, said water being present in amount of about 10% by weight of said liquid, and said liquid being present in amount of about 30% by weight of the combined weight of said silica gel, zeolite, activated carbon and liquid.
Claim 49
Dependent Claim
15 words
The filter of claim 38 wherein said foam is polyurethane containing 20 pores per inch.
Claim 50
Dependent Claim
13 words
The air treatment filter of claim 39, wherein said zeolite is zeolite X.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |