US4153761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing foulants from ion exchange resins
Assignee: United States Department of the Army
•
Filing: 1978-04-21
•
Granted: 1979-05-08
•
Expires: 1998-04-21
Abstract
Abstract Foulants are removed from ion exchange resins by treating the foulant coa ion exchange resin with a weak aqueous solution of a compound that quickly decomposes the foulants.
Inventors
- 👤 Daniel G. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
Method of removing foulants from ion exchange resins in situ consisting of treating the foulant coated resin with a less than 10 percent aqueous solution of a mild oxidizing compound selected from the group consisting of hydrogen peroxide, ozone and sodium peroxide.
Claim 2
Dependent Claim
42 words
Method of removing foulants from ion exchange resins in situ consisting of treating the foulant coated resin with a less than 10 percent aqueous solution of a mild oxidizing compound selected from the group consisting of hydrogen peroxide, ozone and sodium peroxide.
Claim 3
Dependent Claim
17 words
Method according to claim 1 wherein said solution is a three percent aqueous solution of hydrogen peroxide.
Claim 4
Dependent Claim
15 words
Method according to claim 2 wherein said ion exchange resin is an anion exchange resin.
Claim 5
Dependent Claim
15 words
Method according to claim 2 wherein said ion exchange resin is a cation exchange resin.
Claim 6
Dependent Claim
15 words
Method according to claim 1 wherein said ion exchange resin is an anion exchange resin.
Claim 7
Dependent Claim
15 words
Method according to claim 1 wherein said ion exchange resin is a cation exchange resin.
Claim 8
Dependent Claim
36 words
Method of removing photographic waste water foulants from an anion exchange column, said method consisting of adding a three percent aqueous solution of hydrogen peroxide to the column and removing the reaction products from the column.
Claim 9
Dependent Claim
36 words
Method of removing photographic waste water foulants from an anion exchange column, said method consisting of adding a three percent aqueous solution of hydrogen peroxide to the column and removing the reaction products from the column.
References Cited (Backward Citations)
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US3536637A
Cited
US3669631A
Cited
US3791866A
Cited
US3787339A
Cited
US3909403A
Cited
US3932278A
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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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |