US4447254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release of trace elements
Assignee: MCKECHNIE CHEMICALS Ltd
•
Filing: 1981-07-22
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Granted: 1984-05-08
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Expires: 2001-07-22
Abstract
Abstract A composition for providing a substantially controlled level of dissolved trace element in water comprises a trace element compound in a relatively insoluble form. Preferably the composition comprises a relatively insoluble trace element compound and a binder which results in the composition having a different solubility product to that of the trace element alone. The binder may be plaster of paris.
Inventors
- 👤 Alan C. Hughes
- 👤 Richard C. Copeman
- 👤 Thomas N. R. Marples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:43
CPC Classifications
A; A23; A23L; A23L2/00; A23L2/38; A01; A01N; A01N25/00; A01N25/34; A01N59/00; A01N59/16; A01N59/20; A23K; A23K20/00; A23K20/20; A23K20/30
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
54 words
A method of employing in water a composition for releasing a controlled concentration of trace elements therein comprising a relatively water insoluble trace element compound and a plaster of paris binder mixed with said trace element and which mixture provides in water a composition having a different solubility product for the trace element compound.
Claim 2
Independent Claim
54 words
A method of employing in water a composition for releasing a controlled concentration of trace elements therein comprising a relatively water insoluble trace element compound and a plaster of paris binder mixed with said trace element and which mixture provides in water a composition having a different solubility product for the trace element compound.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1 wherein the trace element is selected from the group consisting of copper, cobalt, magnesium, manganese, zinc, selenium, ion, nickel, arsenic, chromium, vanadium, iodine and fluorine.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 2 wherein the trace element is copper.
Claim 5
Dependent Claim
36 words
A method as claimed in claim 3 wherein the trace element compound is selected from the group consisting of copper hydroxide, copper carbonate, copper oxychloride, cuprous oxide, cupric oxide basic copper sulphate, and basic copper carbonate.
Claim 6
Dependent Claim
13 words
A method as clamed in claim 2 wherein the trace element is cobalt.
Claim 7
Dependent Claim
44 words
A method as claimed in claim 5 wherein the trace element compound is selected from the group consisting of cobalt oxide (Co 2 O 3 or Co 3 O 4 ), cobalt carbonate, cobalt hydroxide, cobalt iodide, basic cobalt carbonate and basic cobalt sulphate.
Claim 8
Dependent Claim
13 words
A method as claimed in claim 2 wherein the trace element is selenium.
Claim 9
Dependent Claim
28 words
A method as claimed in claim 7 wherein the trace element compound is selected from the group consisting of selenium oxide, selenium sulphide, sodium selenite and sodium selenate.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 1 wherein the binder is one which will form a settable mouldable composition.
Claim 11
Dependent Claim
22 words
A method as claimed in claim 1 wherein the binder is non-toxic and chemically stable with respect to time, heat and water.
Claim 12
Dependent Claim
22 words
A method as claimed in claim 1 which includes a composition to prevent the trace element ions being taken up by contaminants.
Claim 13
Dependent Claim
24 words
A method as claimed in claim 11 which includes a compound which blocks sites on said contaminant matrix in preferance to trace elements ions.
Claim 14
Dependent Claim
23 words
A method as claimed in claim 11 which includes a compound which complexes the trace element ions and so keeps them in solution.
Claim 15
Dependent Claim
20 words
A method as claimed in claim 11 wherein the trace element is copper and the blocking/complexing compound is a phosphate.
Claim 16
Dependent Claim
13 words
A method as claimed in claim 14 wherein the phosphate is sodium hexametaphosphate.
Claim 17
Independent Claim
28 words
A method as claimed in any one of claims 11 to 15 wherein the amount of blocking/complexing compound is from 0.75 to 1.0% by weight of the composition.
Claim 18
Dependent Claim
22 words
A method as claimed in claim 1 which includes a substance to retard the rate of dissolution of the trace element compound.
Claim 19
Dependent Claim
23 words
A method as claimed in claim 17 wherein said retarder is selected from the group consisting of silicones, stearic acid and salts thereof.
Claim 20
Dependent Claim
22 words
A method as claimed in claim 1 which includes a substance to accelerate the rate of dissolution of the trace element compound.
Claim 21
Dependent Claim
25 words
A method as claimed in claim 19 wherein said accelerator is selected from the group consisting of lignosulphonates, reducing sugars, ethylene glycol and basic compounds.
Claim 22
Dependent Claim
16 words
A method as claimed in claim 1 wherein the composition is in the form of tablets.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |