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US4190532A
Expired / Lapsed
US
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Charged filter aid material and ion exchange bed
Assignee: Ecodyne Corp
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Filing: 1977-10-21
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Granted: 1980-02-26
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Expires: 1997-10-21
Abstract
Abstract A method for preparing an improved filter material, together with the improved material prepared thereby and an improved method for removing impurities from a liquid. The filter material comprises a mixture of ion exchange resin particles and treated filter aid material. In the preferred embodiment, the ion exchange resin particles comprise a mixture of anion and cation exchange resin particles, and the filter aid material is treated with a chemical compound to produce a positive surface charge thereon. The filter aid material may be further treated with a second compound to produce an enhanced negative surface charge.
Inventors
- 👤 Christopher J. Halbfoster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:20
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01J; B01J47/00; B01J47/018; B01J47/12; B01J47/133
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
75 words
An improved filter material comprising: a mixture of cation exchange resin particles and treated filter-aid material, said mixture being capable of producing a clumping phenomenon said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 2
Dependent Claim
75 words
An improved filter material comprising: a mixture of cation exchange resin particles and treated filter-aid material, said mixture being capable of producing a clumping phenomenon said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 3
Dependent Claim
41 words
The filter material as defined in claim 1 further comprising anion exchange resin particles in the size range of about 60-400 mesh, said anion exchange resin particles comprising about 5 to 95 percent of the total weight of said resin particles.
Claim 4
Dependent Claim
16 words
The filter material as defined in claim 1 wherein said filter aid material is regenerated cellulose.
Claim 5
Dependent Claim
16 words
The filter material as defined in claim 1 wherein said electrolyte-type compound is a cationic polyelectrolyte.
Claim 6
Dependent Claim
32 words
The filter material as defined in claim 1 wherein said filter aid material is present in an amount from about 20% to about 80%, based on the weight of said resin particles.
Claim 7
Dependent Claim
103 words
An improved filter material comprising: a mixture of anion exchange resin particles, cation exchange resin particles, and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, said anion exchange resin particles being present in an amount from about 5% to about 95% based on the total weight of said resin particles, and said filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 8
Dependent Claim
103 words
An improved filter material comprising: a mixture of anion exchange resin particles, cation exchange resin particles, and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, said anion exchange resin particles being present in an amount from about 5% to about 95% based on the total weight of said resin particles, and said filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 9
Dependent Claim
32 words
The filter material as defined in claim 6 wherein said filter aid material is present in an amount from about 20% to about 80% based on the weight of said resin particles.
Claim 10
Dependent Claim
16 words
The filter material as defined in claim 6 wherein said electrolyte-type compound is a cationic polyelectrolyte.
Claim 11
Dependent Claim
16 words
The filter material as defined in claim 8 wherein said filter aid material is regenerated cellulose.
Claim 12
Dependent Claim
109 words
An improved filter material comprising: a mixture of anion exchange resin particles and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon, and said filter aid material having been subsequently treated with an anionic polyelectrolyte to produce an enhanced negative surface charge by bonding to said filter aid material previously treated with said cationic polyelectrolyte.
Claim 13
Dependent Claim
109 words
An improved filter material comprising: a mixture of anion exchange resin particles and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon, and said filter aid material having been subsequently treated with an anionic polyelectrolyte to produce an enhanced negative surface charge by bonding to said filter aid material previously treated with said cationic polyelectrolyte.
Claim 14
Dependent Claim
47 words
The filter material as defined in claim 10 further comprising cation exchange resin particles in the size range of about 60-400 mesh, said cation exchange resin particles being present in an amount from about 5% to about 95% based on the total weight of said resin particles.
Claim 15
Dependent Claim
16 words
The filter material as defined in claim 10 wherein said filter aid material is regenerated cellulose.
Claim 16
Dependent Claim
32 words
The filter material as defined in claim 10 wherein said filter aid material is present in an amount from about 20% to about 80% based on the weight of said resin particles.
Claim 17
Dependent Claim
56 words
The filter material as defined in claim 13 further comprising cation exchange resin particles in the size range of about 60-400 mesh, said cation exchange resin particles being present in an amount from about 5% to about 95%, based on the total weight of said resin particles, and wherein said filter aid material is regenerated cellulose.
Claim 18
Independent Claim
85 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of cation exchange resin particles and treated filter aid material, said mixture producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 19
Independent Claim
85 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of cation exchange resin particles and treated filter aid material, said mixture producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 20
Dependent Claim
52 words
The method as defined in claim 15 wherein said filter bed further comprises anion exchange resin particles in the size range of about 60 to 400 mesh, said anion exchange resin particles being present in an amount from about 5% to about 95% based on the total weight of said resin particles.
Claim 21
Dependent Claim
15 words
The method as defined in claim 15 wherein said filter aid material is regenerated cellulose.
Claim 22
Dependent Claim
15 words
The method as defined in claim 15 wherein said electrolyte-type compound is a cationic polyelectrolyte.
Claim 23
Dependent Claim
31 words
The method as defined in claim 15 wherein said filter aid material is present in an amount from about 20% to about 80%, based on the weight of said resin particles.
Claim 24
Independent Claim
117 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of anion exchange resin particles, cation exchange resin particles, and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, said anion exchange resin particles being present in an amount from about 5% to about 95%, based on the total weight of said resin particles, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 25
Independent Claim
117 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of anion exchange resin particles, cation exchange resin particles, and treated filter aid material, said mixture being capable of producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, said anion exchange resin particles being present in an amount from about 5% to about 95%, based on the total weight of said resin particles, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with an electrolyte-type compound that produces a positive surface charge by bonding thereon.
Claim 26
Dependent Claim
32 words
The method as defined in claim 20 wherein said treated filter aid material is present in an amount from about 20% to about 80%, based on the weight of said resin particles.
Claim 27
Dependent Claim
15 words
The method as defined in claim 21 wherein said electrolyte-type compound is a cationic polyelectrolyte.
Claim 28
Dependent Claim
15 words
The method as defined in claim 22 wherein said filter aid material is regenerated cellulose.
Claim 29
Independent Claim
118 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of anion exchange resin particles and treated filter aid material, said mixture producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon, and said filter aid material having been subsequently treated with an anionic polyelectrolyte to produce an enhanced negative surface charge by bonding to said filter aid material previously treated with said cationic polyelectrolyte.
Claim 30
Independent Claim
118 words
A method for removing impurities from a liquid comprising: passing a liquid through a filter bed comprising a mixture of anion exchange resin particles and treated filter aid material, said mixture producing a clumping phenomenon, said resin particles being in the size range of about 60 to 400 mesh, and said treated filter aid material being characterized by a negative surface charge prior to treatment, said filter aid material having been treated with a cationic polyelectrolyte to produce a positive surface charge by bonding thereon, and said filter aid material having been subsequently treated with an anionic polyelectrolyte to produce an enhanced negative surface charge by bonding to said filter aid material previously treated with said cationic polyelectrolyte.
Claim 31
Dependent Claim
52 words
The method as defined in claim 24 wherein said filter bed further comprises cation exchange resin particles in the size range of about 60 to 400 mesh, said cation exchange resin particles being present in an amount from about 5% to about 95% based on the total weight of said resin particles.
Claim 32
Dependent Claim
15 words
The method as defined in claim 25 wherein said filter aid material is regenerated cellulose.
Claim 33
Dependent Claim
32 words
The method as defined in claim 25 wherein said filter aid material is present in an amount of from about 20% to about 80% based on the weight of said resin particles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |