US4180473A
Expired / Lapsed
US
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Method of transporting metal ions
Assignee: National Research Laboratories
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Filing: 1977-10-21
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Granted: 1979-12-25
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Expires: 1997-10-21
Abstract
Abstract A method of transporting metal ions by introducing a metal complex into a medium containing a moiety which demands the metal ion and the complex releases the ions in a controlled manner upon demand. The metal complexes have an aqueous proton induced dissociation property represented by a sigmoidally-shaped curve on a cartesian coordinate plot of the negative log of the metal ion concentration versus the negative log of hydrogen ion concentration. This dissociation property causes a controlled release of metal ion into mediums containing a reacting moiety upon demand for the metal ion. For example, metalworking emulsions of oil and water are stabilized by the addition thereto of minor amounts of a metal complex, e.g., disodium monocopper(II) citrate, which at alkaline pH metalworking conditions above about 7 to about 9 releases metal cations to the emulsions imparting stabilizing characteristics which prevent emulsion degradation by a number of factors commonly encountered in metalworking operations. Also, the method is effective in the controlled release of metal ions in the normal range of physiological pH, i.e., about 4 to 9, for growth controlling action against microorganisms including bacteria, fungi and viruses.
Inventors
- 👤 Gerald L. Maurer
- 👤 Sudhir K. Shringarpurey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:59
CPC Classifications
A; A01; A01N; A01N37/00; A01N37/36; A01N37/44; A01N57/00; A01N57/18; A01N57/20; C; C07; C07C; C07C59/00; C07C59/235; C07C59/245; C07C59/265; C07F; C07F1/00; C07F1/005; C10; C10M; C10M2201/00; C10M2201/02; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/125; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/287; C10M2207/289; C10M2207/40; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/08; C10M2215/082; C10M2215/24; C10M2215/28; C10M2219/00; C10M2219/04; C10M2219/042; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2225/00; C10M2225/02; C10M2227/00; C10M2227/09; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/08; C10N2010/10; C10N2010/12; C10N2010/14; C10N2010/16; C10N2040/00; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01; Y; Y10; Y10S; Y10S424/00; Y10S424/06; Y10S516/00; Y10S516/01; Y10S516/06; Y10S516/905; Y10S516/917; Y10S516/919
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A method of transporting metal ions in a medium containing a moiety demanding said metal ions by introducing into said medium in an effective amount a metal complex of a metal ion and a polyfunctional organic ligand, said complex having an aqueous proton induced dissociation property represented by a sigmoidally-shaped curve on a cartesian coordinate plot of the negative log of the metal ion concentration versus the negative log of the hydrogen ion concentration, said dissociation property causing the controlled release of metal ions upon demand of said moiety.
Claim 2
Independent Claim
89 words
A method of transporting metal ions in a medium containing a moiety demanding said metal ions by introducing into said medium in an effective amount a metal complex of a metal ion and a polyfunctional organic ligand, said complex having an aqueous proton induced dissociation property represented by a sigmoidally-shaped curve on a cartesian coordinate plot of the negative log of the metal ion concentration versus the negative log of the hydrogen ion concentration, said dissociation property causing the controlled release of metal ions upon demand of said moiety.
Claim 3
Dependent Claim
50 words
The method of claim 1 wherein said complex is a metal complex of a heavy metal ion and a polyfunctional organic ligand in a ratio of 1:1 of the metal ion to the ligand, said ligand selected from the group consisting of an organic acid and a substituted organic acid.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said medium is controlled within a pH range on the order of about 3 to about 12.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein said pH is controlled within the range of about 4 to about 9.
Claim 6
Dependent Claim
10 words
The method of claim 2 wherein said pH is alkaline.
Claim 7
Dependent Claim
19 words
The method of claim 5 wherein said pH is alkaline within the range of about 9 to about 12.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said complex is a dialkalimetal monoheavymetal chelate of an alpha-hydroxy polycarboxylic acid.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein said chelate is dialkalimetal monocopper(II) citrate.
Claim 10
Dependent Claim
12 words
The method of claim 8 wherein said chelate is in aqueous admixture.
Claim 11
Dependent Claim
11 words
The method of claim 8 wherein said chelate is a solid.
Claim 12
Dependent Claim
15 words
The method of claim 2 wherein the metal complex is a dialkalimetal monocopper(II) citrate complex.
Claim 13
Dependent Claim
12 words
The method of claim 11 wherein the medium has an alkaline pH.
Claim 14
Dependent Claim
37 words
The method of claim 11 wherein the pH range of the medium is from about 7 to about 9 and about 10% to about 0.1% of said copper ion in said complex is released within said range.
Claim 15
Dependent Claim
25 words
The method of claim 2 wherein said metal ion is selected from the group consisting of zinc, nickel, chromium, bismuth, mercury, silver, copper, and cobalt.
Claim 16
Dependent Claim
26 words
The method of claim 14 wherein said substituted organic acid is selected from the group consisting of hydroxy polycarboxylic, amino polycarboxylic, sulfhydro polycarboxylic, and phosphinol polycarboxylic.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |