Patent US4252905A successfully refreshed from Google Patents.
US4252905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a mixture of ion exchange resins
Assignee: Ecodyne Corp
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Filing: 1979-07-06
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Granted: 1981-02-24
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Expires: 1999-07-06
Abstract
Abstract A method of preparing a mixture of cation and anion exchange resins in the size range of about 10 to 250 microns, comprising combining cation exchange resins and anion exchange resins of a size larger than 60 mesh and grinding the combination of anion and cation exchange resins to a size range of about 10 to 250 microns.
Inventors
- 👤 Walter C. Bass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:57
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/04; B01J47/12; B01J47/133
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
59 words
A method of preparing a mixture of cation and anion exchange resin particles substantially all of which are in a size range of about 10 to 250 microns, comprising: combining large bead cation and anion exchange resin particles; and grinding the combination of anion and cation exchange resin particles to a size range of about 10 to 250 microns.
Claim 2
Independent Claim
59 words
A method of preparing a mixture of cation and anion exchange resin particles substantially all of which are in a size range of about 10 to 250 microns, comprising: combining large bead cation and anion exchange resin particles; and grinding the combination of anion and cation exchange resin particles to a size range of about 10 to 250 microns.
Claim 3
Independent Claim
55 words
A method of preparing a filter precoat medium having particles substantially all in a size range of about 60 to 400 mesh, comprising: combining large bead anion and cation exchange resin particles; and grinding the combination of anion exchange resin and cation exchange resin particles to a size range of about 60 to 400 mesh.
Claim 4
Independent Claim
55 words
A method of preparing a filter precoat medium having particles substantially all in a size range of about 60 to 400 mesh, comprising: combining large bead anion and cation exchange resin particles; and grinding the combination of anion exchange resin and cation exchange resin particles to a size range of about 60 to 400 mesh.
Claim 5
Independent Claim
27 words
The method of claims 1 or 2 wherein the step of grinding reduces the combination of particles to a size range of about 10 to 40 microns.
Claim 6
Dependent Claim
27 words
The method of claim 1 or 2 wherein the cation exchange resin is in the ammonium form and the anion exchange resin is in the hydroxide form.
Claim 7
Independent Claim
27 words
The method of claims 1 or 2 wherein the cation exchange resin is in the hydrogen form and the anion exchange resin is in the hydroxide form.
Claim 8
Independent Claim
29 words
The method of claims 1 or 2 wherein the ratio by weight of cation exchange resins to anion exchange resins is between 3 to 1 and 1 to 1.
Claim 9
Independent Claim
43 words
The method of claims 1 or 2 wherein the step of grinding the combination of anion and cation exchange resins includes feeding the resin combination into a hammer mill having a retaining screen with uniform aperture sizes between about 0.020 to 0.070 inches.
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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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |