US4107064A
Expired / Lapsed
US
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Metal sequestering method
Assignee: Albemarle Corp
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Filing: 1977-08-15
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Granted: 1978-08-15
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Expires: 1997-08-15
Abstract
Abstract A method for sequestering metal ions using α,α'-carboxyalkoxy succinic acid or salts thereof in combination with a surfactant. SP CROSS-REFERENCE TO RELATED APPLICATIONS This application is a division of application Ser. No. 682,320, filed May 3, 1976, now U.S. Pat. No. 4,066,687, which is a division of application Ser. No. 385,545, filed Aug. 3, 1973, now U.S. Pat. No. 3,980,578, which in turn is a continuation-in-part of application Ser. No. 153,816, filed June 16, 1971, now U.S. Pat. No. 3,784,486.
Inventors
- 👤 Gunner E. Nelson
- 👤 Tillmon H. Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:12
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2089; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
The method of sequestering sequesterable metal ions in an aqueous solution which comprises introducing into said solution a sequestrant composition selected from the group consisting of: (a) α,α'-carboxyalkoxy succinic acid, wherein the carboxyalkoxy radicals contain from 2 to about 7 carbon atoms, (b) water soluble salts of said acids; and (c) mixtures of (a) and (b), and a surfactant selected from the group consisting of anionic detergents, cationic detergents, nonionic detergents, ampholytic detergents, zwitterionic detergents and mixtures thereof, the ratio by weight of the surfactant to the sequestrant being from about 10:1 to about 1:10.
Claim 2
Independent Claim
95 words
The method of sequestering sequesterable metal ions in an aqueous solution which comprises introducing into said solution a sequestrant composition selected from the group consisting of: (a) α,α'-carboxyalkoxy succinic acid, wherein the carboxyalkoxy radicals contain from 2 to about 7 carbon atoms, (b) water soluble salts of said acids; and (c) mixtures of (a) and (b), and a surfactant selected from the group consisting of anionic detergents, cationic detergents, nonionic detergents, ampholytic detergents, zwitterionic detergents and mixtures thereof, the ratio by weight of the surfactant to the sequestrant being from about 10:1 to about 1:10.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein the sequesterable metal ion is calcium or magnesium.
Claim 4
Dependent Claim
13 words
The method of claim 1, wherein the carboxyalkoxy radicals contain 2 carbon atoms.
Claim 5
Dependent Claim
24 words
The method of claim 1, wherein the water soluble salts are alkali metal salts, alkaline earth metal salts, ammonium salts or alkyl ammonium salts.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein the water soluble salts are sodium or potassium salts.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein the water soluble salt is a sodium salt of α,α'-carboxymethoxy succinic acid.
Claim 8
Dependent Claim
18 words
The method of claim 1, wherein the water soluble salt is a potassium salt of α,α'-carboxymethoxy succinic acid.
Claim 9
Dependent Claim
26 words
The method of claim 1, wherein the sequestrant composition is α,α'-carboxymethoxy succinic acid, tetra sodium salt or α,α'-carboxymethoxy succinic acid, tetra potassium salt and a surfactant.
Claim 10
Dependent Claim
16 words
The method of claim 1, wherein the sequestrant composition is α,α'-carboxymethoxy succinic acid and a surfactant.
References Cited (Backward Citations)
US3692685A
Cited
US3725290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |