Patent US4007301A successfully refreshed from Google Patents.
US4007301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for precoating a filter with a mixture of anion and cation exchange resin particles
Assignee: Ecodyne Corp
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Filing: 1974-07-29
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Granted: 1977-02-08
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Expires: 1994-07-29
Abstract
Abstract An improved method for precoating a filter with a mixture of anion and cation exchange resin particles in the size range of about 60 to 400 mesh is provided, wherein a floc of anion and cation exchange resins is formed by mixing these resins in aqueous suspension at elevated temperatures in the range of about 100 DEG to 212 DEG F. and coating these resins onto a filter.
Inventors
- 👤 Roberto De Martino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:50
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/12; B01J47/133
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles in the size range of about 60 to 400 mesh comprising:mixing said anion and cation exchange resins in aqueous suspension at a temperature of about 100° to 212° F., whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 2
Independent Claim
66 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles in the size range of about 60 to 400 mesh comprising:mixing said anion and cation exchange resins in aqueous suspension at a temperature of about 100° to 212° F., whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 3
Dependent Claim
16 words
A method as defined in claim 1 wherein said temperature is about 125° to 212° F.
Claim 4
Independent Claim
89 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles in the size range of about 60 to 400 mesh comprising: mixing said anion and cation exchange resins in aqueous suspension at a temperature of about 100° to 212° F., the ratio of said cation exchange resin to said anion exchange resin being at least about 5:1 on a dry weight basis, whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 5
Independent Claim
89 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles in the size range of about 60 to 400 mesh comprising: mixing said anion and cation exchange resins in aqueous suspension at a temperature of about 100° to 212° F., the ratio of said cation exchange resin to said anion exchange resin being at least about 5:1 on a dry weight basis, whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 6
Dependent Claim
14 words
The method as defined in claim 3 wherein said temperature is about 125°-212° F.
Claim 7
Independent Claim
119 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles comprising: mixing cation and anion exchange resin particles in aqueous suspension at a temperature of at least about 100°-212° F., said resin particles being in the size range of about 60-400 mesh, and said resins being of the styrene-divinylbenzene copolymer type, said cation exchange resin having sulfonic acid active groups and said anion exchange resin having quaternary ammonium active groups, the ratio of said cation exchange resin to said anion exchange resin being at least about 5:1 on a dry weight basis, whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 8
Independent Claim
119 words
A method for precoating a filter with a mixture of anion and cation exchange resin particles comprising: mixing cation and anion exchange resin particles in aqueous suspension at a temperature of at least about 100°-212° F., said resin particles being in the size range of about 60-400 mesh, and said resins being of the styrene-divinylbenzene copolymer type, said cation exchange resin having sulfonic acid active groups and said anion exchange resin having quaternary ammonium active groups, the ratio of said cation exchange resin to said anion exchange resin being at least about 5:1 on a dry weight basis, whereby to cause said resins to agglomerate with one another to form larger particles; and coating said resins onto a filter.
Claim 9
Dependent Claim
18 words
The method as defined in claim 5 wherein said temperature is in the range of about 125°-200° F.
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |