US5149437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filter
Assignee: Individual
•
Filing: 1991-03-29
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Granted: 1992-09-22
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Expires: 2011-03-29
Abstract
Abstract An improved filter device is provided for removing contaminants from water comprising a filter housing having an inlet at one end for water to be purified and an oulet for purified water at an opposing end, said filter device including in sequence first, second and third layers of purification material, a first layer of purification material comprising metallic particles which establish a suitable redox potential in the first layer, a second layer of purification material comprising activated carbon, and a third layer of purification material comprising a weak acid ion exchange resin.
Inventors
- 👤 Theodore L. Wilkinson
- 👤 Frank J. Sork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F1/42; C02F1/46; C02F1/461; C02F1/46104; C02F1/46176; C02F1/50; C02F1/505; C02F9/00; C02F9/20; C02F1/28; C02F1/283; C02F2001/425; C02F2101/00; C02F2101/10; C02F2101/20; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
A filter device for removing contaminants from water comprising: inlet means for water to be treated and an outlet means for treater water, first, second and third water purification materials in sequence from said inlet means to said outlet means, said first purification material comprising a bed of particles of dissimilar metals having first and second redox potentials such that conditions are established in the bed for spontaneous oxidation and reduction reactions between contaminants present in the water and said metal particles upon contact of said water with said first material, said second purification material comprising activated carbon, and said third purification material comprising a weak acid cation exchange resin.
Claim 2
Dependent Claim
110 words
A filter device for removing contaminants from water comprising: inlet means for water to be treated and an outlet means for treater water, first, second and third water purification materials in sequence from said inlet means to said outlet means, said first purification material comprising a bed of particles of dissimilar metals having first and second redox potentials such that conditions are established in the bed for spontaneous oxidation and reduction reactions between contaminants present in the water and said metal particles upon contact of said water with said first material, said second purification material comprising activated carbon, and said third purification material comprising a weak acid cation exchange resin.
Claim 3
Dependent Claim
19 words
The filter device of claim 1 wherein said first material comprises particles of copper and a second dissimilar metal.
Claim 4
Dependent Claim
16 words
The filter device of claim 2 wherein said first material comprises particles of copper and zinc.
Claim 5
Dependent Claim
18 words
The filter device of claim 1 wherein said dissimilar metals are present in the form of an alloy.
Claim 6
Dependent Claim
16 words
The filter device of claim 4 wherein said alloy comprises an alloy of copper and zinc.
Claim 7
Dependent Claim
21 words
The filter device of claim 5 wherein said alloy comprises copper and zinc in the ratio of approximately 50:50 to 85:15.
Claim 8
Dependent Claim
23 words
The filter device of claim 1 wherein said first, second and third materials are employed in approximately equal volumes in said filter device.
Claim 9
Dependent Claim
17 words
The filter device of claim 1 further comprising a sediment filter layer preceding said first purification material.
Claim 10
Dependent Claim
14 words
The filter device of claim wherein said second purification material comprises silver-treated activated carbon.
Claim 11
Dependent Claim
29 words
The filter device of claim 1 wherein said filter device comprises a unitary filter housing which contains said first, second and third as distinct separate layers of purification materials.
Claim 12
Dependent Claim
17 words
The filter device of claim 10 further comprising foraminous dividers positioned between said layers of purification material.
Claim 13
Dependent Claim
24 words
The filter device of claim 1 wherein said filter device comprises at least three distinct filter housings each containing one of said purification materials.
Claim 14
Independent Claim
111 words
A method for the purification of water which comprises sequentially contacting water with first, second and third layers of water purification materials, said first layer of purification material comprising a bed of particles of dissimilar metals having first and second redox potentials such that conditions are established in said bed for spontaneous oxidation and reduction reactions between contaminants present in the water and said metal particles upon contact of said water with said first material, said second layer of purification material comprising activated carbon, and said third layer of purification material comprising a weak acid cation exchange resin, and recovering purified water subsequent to contacting said first, second and third layers.
Claim 15
Independent Claim
111 words
A method for the purification of water which comprises sequentially contacting water with first, second and third layers of water purification materials, said first layer of purification material comprising a bed of particles of dissimilar metals having first and second redox potentials such that conditions are established in said bed for spontaneous oxidation and reduction reactions between contaminants present in the water and said metal particles upon contact of said water with said first material, said second layer of purification material comprising activated carbon, and said third layer of purification material comprising a weak acid cation exchange resin, and recovering purified water subsequent to contacting said first, second and third layers.
Claim 16
Dependent Claim
19 words
The method of claim 13 wherein said first layer comprises particles comprised of copper and a second dissimilar metal.
Claim 17
Dependent Claim
15 words
The method of claim 14 wherein said first layer comprises particles of copper and zinc.
Claim 18
Dependent Claim
17 words
The method of claim 13 wherein said dissimilar metals are present in the form of an alloy.
Claim 19
Dependent Claim
15 words
The method of claim 16 wherein said alloy comprises an alloy of copper and zinc.
Claim 20
Dependent Claim
20 words
The method of claim 17 wherein said alloy comprises copper and zinc in the ratio of approximately 50:50 to 85:15.
Claim 21
Dependent Claim
14 words
The method of claim 13 wherein said second purification material comprises silver-treated activated carbon.
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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) | 1995-09-22 | 1996-03-23 | 1996-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-22 | 2000-03-23 | 2000-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-22 | 2004-03-23 | 2004-09-22 | $7700.00 | Window Closed / Lapsed |