US3681416A
Expired / Lapsed
US
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Process for the production of metal chelates
Assignee: Novartis Corp
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Filing: 1968-10-29
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Granted: 1972-08-01
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Expires: 1988-10-29
Abstract
Abstract Method for the production of metal chelates by reacting an amino nitrile with sodium or potassium hydroxide and a metal oxide, or metal hydroxide. The metal chelates thus obtained are useful in correcting soil deficiencies and as nutrients for plants.
Inventors
- 👤 Ralph Miller
- 👤 Jorg H Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:38
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; H; H01; H01R; H01R4/00; H01R4/28; H01R4/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
A process according to claim 1, wherein the reaction is conducted at a temperature of about 85* C.
Claim 2
Dependent Claim
17 words
A process according to claim 1, wherein the metal oxide used is zinc oxide or copper oxide.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein the metal hydroxide used is calcium hydroxide.
Claim 4
Dependent Claim
29 words
A process according to claim 1, wherein disodium zinc ethylenediamino tetraacetate is obtained by hydrolyzing ethylenediamine tetraacetonitrile with sodium hydroxide followed by reacting the hydrolysis product with zinc oxide.
Claim 5
Dependent Claim
29 words
A process according to claim 1, wherein disodium calcium ethylenediamino tetraacetate is obtained by hydrolyzing ethylenediamine tetraacetonitrile with sodium hydroxide followed by reacting the hydrolysis product with calcium hydroxide.
Claim 6
Dependent Claim
90 words
A process for the preparation of bivalent metal chelates of di-alkali metal salts of ethylenediamine tetraacetic acid which comprises reacting: a. ethylenediamine tetraacetonitrile with b. sodium or potassium hydroxide and c. the oxide or hydroxide of a bivalent metal, said metal being selected from the group consisting of copper, iron, magnesium, manganese, zinc, calcium, nickel and cobalt; the molar ratio of (a):(b):(c) being essentially 1:2:1 and the reaction being effected in an aqueous medium at a temperature of the order of 100*C and being continued to completion of ammonia evolution.
References Cited (Backward Citations)
US3078289A
Cited
US3409666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |