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Patent US3640698A successfully refreshed from Google Patents.
US3640698A
Expired / Lapsed
US
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Fertilizer urea solutions containing micronutrients
Assignee: Union Oil Company of California
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Filing: 1970-03-19
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Granted: 1972-02-08
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Expires: 1990-03-19
Abstract
Abstract A fertilizer solution for treatment of plants and soils to correct micronutrient deficiencies is disclosed and comprises an aqueous urea solution having an acidic pH value, less than 4, and containing the sulfate salts of iron, zinc or manganese. An aqueous urea-micronutrient solution containing potassium and phosphorous is also disclosed.
Inventors
- 👤 Peter Stanley Backlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:20
CPC Classifications
C; C05; C05B; C05B7/00; C05G; C05G5/00; C05G5/20; C05G5/23
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
The fertilizer solution defined in claim 1 wherein said mineral acid is sulfuric, nitric or phosphoric acid.
Claim 2
Dependent Claim
20 words
The fertilizer solution defined in claim 1 wherein the pH of said solution is maintained between about 1.5 and 4.0.
Claim 3
Dependent Claim
23 words
The fertilizer solution defined in claim 1 wherein saiD solution has a salting out concentration at a temperature of less than 0* C.
Claim 4
Dependent Claim
50 words
The fertilizer solution defined in claim 1 wherein said micronutrient is present in an amount between about 1 and 35 weight percent, said urea is present in an amount between about 5 and 55 weight percent and said water is present in an amount between 20 and 60 weight percent.
Claim 5
Dependent Claim
113 words
An aqueous solution having a pH from about 1.5 to 4.0 and consisting essentially of from 1 to about 35 weight percent of a micronutrient solute selected from the group consisting of ferrous sulfate, manganese sulfate, zinc sulfate or mixtures thereof, from about 5 to about 55 weight percent of urea solute and from about 20 to about 60 weight percent water; the concentration of said solutes in said solution being greater than the additive concentrations of an aqueous solution saturated at 0* C. with said micronutrient solute and an aqueous solution saturated at 0*C. with said urea solute and less than the salting out concentration at a temperature of about 20* C.
Claim 6
Dependent Claim
34 words
The solution defined in claim 6 wherein said solution also contains a soluble potassium salt in a sufficient quantity to provide a K2O content in said solution of between 1 and 5 weight percent.
Claim 7
Dependent Claim
33 words
The solution defined in claim 6 wherein said solution also contains phosphoric acid in an amount sufficient to provide a P2O5 content in said solution of between about 1 and 10 weight percent.
Claim 8
Dependent Claim
40 words
The solution defined in claim 6 wherein said solution also contains soluble salts of potassium and phosphorus and has an N-P-K content between about 1- 10 weight percent N, 1- 10 weight percent P2O4 and 1- 5 weight percent K2O.
Claim 9
Dependent Claim
55 words
A solution comprising water, urea and at least one weight percent of a micronutrient selected from the group consisting of manganese sulfate, ferrous sulfate, zinc sulfate and mixtures thereof and having a pH between about 1.5 and 4.0; said solution having a salting out concentration at a temperature between about 0* C. and 20* C.
Claim 10
Dependent Claim
33 words
The solution defined in claim 10 wherein said micronutrient is ferrous sulfate and has a concentration enclosed by the area defined by lines W-C, C-X, X-Y, Y-C1, C1-Z and Z-W of FIG. 1.
Claim 11
Dependent Claim
33 words
The solution defined in claim 10 wherein said micronutrient is manganese sulfate and has a concentration enclosed by the area defined by lines W-C, C-X, X-Y, Y-C1, C1-Z and Z-W of FIG. 2.
Claim 12
Dependent Claim
33 words
The solution defined in claim 10 wherein said micronutrient is zinc sulfate and has a concentration enclosed by the area defined by lines W-C, C-X, X-Y, Y-C1, C1-Z and Z-W of FIG. 3.
Claim 13
Dependent Claim
41 words
The solution defined in claim 10 wherein said micronutrient is a mixture of ferrous sulfate, zinc sulfate and manganese sulfate and has a concentration enclosed by the area defined by lines W-C, C-X, X-Y, Y-C1, C1-Z and Z-W of FIG. 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |