Patent US5114458A successfully refreshed from Google Patents.
US5114458A
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Fertilizers having a high hardness and storage stability
Assignee: Intevep SA
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Filing: 1991-03-14
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Granted: 1992-05-19
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Expires: 2011-03-14
Abstract
Abstract A fertilizer composition characterized by high mechanical resistance and anti-caking properties comprises a compound selected from the group consisting of urea, ammonium sulphate, nitrogen-potassium-phosphorus granulates, mono-ammonic phosphate, di-ammonic phosphate, potassium chloride and mixtures thereof admixed with a hydrosoluble lignate salt selected from the group consisting of sodium lignates, alkaline metal lignates, ammonium lignates, and mixtures thereof in an amount of between 0.1 to 5.0 wt. % in the final fertilizer composition.
Inventors
- 👤 Jose R. Castillo
- 👤 Marilu S. de Liendo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:41
CPC Classifications
C; C05; C05G; C05G3/00; C05G3/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A fertilizer composition characterized by high mechanical resistance and anti-caking properties comprising: (a) a compound selected from the group consisting of urea, ammonium sulphate, nitrogen-potassium-phosphorus granulates, mono-ammonic phosphate, di-ammonic phosphate, potassium chloride and mixtures thereof; and (b) a hydrosoluble lignate salt selected from the group consisting of sodium lignates, alkaline metal lignates, ammonium lignates, and mixtures thereof in an amount of between 0.1 to 5.0 wt. % in the final fertilizer composition such that said fertilizer formula possesses a high mechanical resistance and a low tendency to lumping without affecting the capacity of dissolution thereof.
Claim 2
Dependent Claim
95 words
A fertilizer composition characterized by high mechanical resistance and anti-caking properties comprising: (a) a compound selected from the group consisting of urea, ammonium sulphate, nitrogen-potassium-phosphorus granulates, mono-ammonic phosphate, di-ammonic phosphate, potassium chloride and mixtures thereof; and (b) a hydrosoluble lignate salt selected from the group consisting of sodium lignates, alkaline metal lignates, ammonium lignates, and mixtures thereof in an amount of between 0.1 to 5.0 wt. % in the final fertilizer composition such that said fertilizer formula possesses a high mechanical resistance and a low tendency to lumping without affecting the capacity of dissolution thereof.
Claim 3
Dependent Claim
17 words
A fertilizer according to claim 1 wherein said hydrosoluble lignate salt is a sulphur free sodium lignate.
Claim 4
Dependent Claim
33 words
A fertilizer according to claim 1 wherein the compound is urea and the hydrosoluble lignate salt is present in an amount of between 0.1 to 1.0 wt. % in the final fertilizer composition.
Claim 5
Dependent Claim
34 words
A fertilizer according to claim 1 wherein the compound is ammonium sulphate and the hydrosoluble lignate salt is present in an amount of between 2.6 to 4.8 wt. % in the final fertilizer composition.
Claim 6
Independent Claim
113 words
A method for producing a fertilizer characterized by improved high mechanical resistance and anti-caking properties comprising the steps of: (a) providing a compound selected from the group consisting of urea, ammonium sulphate, nitrogen-potassium-phosphorus granulates, mono-ammonic phosphate, di-ammonic phosphate, potassium chloride and mixtures thereof; (b) adding to said compound a hydrosoluble lignate salt selected from the group consisting of sodium lignates, alkaline metal lignates, ammonium lignates, and mixtures thereof in an amount of between 0.1 to 5.0 wt. % in the final fertilizer composition; (c) mixing said compound and said lignate salt so as to produce a homogeneous mixture thereof; and (d) processing said mixture so as to obtain a desired particulate material form.
Claim 7
Independent Claim
113 words
A method for producing a fertilizer characterized by improved high mechanical resistance and anti-caking properties comprising the steps of: (a) providing a compound selected from the group consisting of urea, ammonium sulphate, nitrogen-potassium-phosphorus granulates, mono-ammonic phosphate, di-ammonic phosphate, potassium chloride and mixtures thereof; (b) adding to said compound a hydrosoluble lignate salt selected from the group consisting of sodium lignates, alkaline metal lignates, ammonium lignates, and mixtures thereof in an amount of between 0.1 to 5.0 wt. % in the final fertilizer composition; (c) mixing said compound and said lignate salt so as to produce a homogeneous mixture thereof; and (d) processing said mixture so as to obtain a desired particulate material form.
Claim 8
Dependent Claim
17 words
A method according to claim 5 including providing a sulphur free sodium lignate as said lignate salt.
Claim 9
Dependent Claim
26 words
A method according to claim 5 including the steps of heating the mixture of compound and lignate salt prior to processing to desired particulate material form.
Claim 10
Dependent Claim
19 words
A method according to claim 5 including the step of processing a "soda liquor" to obtain said ignate salt.
Claim 11
Dependent Claim
26 words
A method according to claim 8 where said "soda liquor" is the waste liquor from treating sugar cane bagasse with sodium hidroxide for obtaining paper pulp.
References Cited (Backward Citations)
US3353949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |