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US3798020A
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Process for incorporating micronutrients in liquid phosphatic fertilizers
Assignee: FERTILIZER INDUSTRIES Inc
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Filing: 1971-06-17
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Granted: 1974-03-19
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Expires: 1991-06-17
Abstract
Abstract The sequestration of micronutrient metal ions in liquid phosphatic fertilizer solutions is facilitated by incorporating in the solutions a synergistic combination of citrate and polyphosphate salts.
Inventors
- 👤 T Parham
- 👤 J Sansing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:17
CPC Classifications
C; C05; C05D; C05D9/00; C05D9/02; C05G; C05G5/00; C05G5/20; C05G5/23
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the water-soluble polyphosphate is ammonium polyphosphate.
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein the micronutrient metal cation is zinc.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the micronutrient metal cation is iron.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the micronutrient metal cation is copper.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the micronutrient metal cation is manganese.
Claim 6
Dependent Claim
48 words
The process of claim 1 wherein the polyphosphate is ammonium polyphosphate derived from superphosphoric acid and is in the form of an aqueous solution containing orthophosphate and polymeric phosphates, said polymeric phosphates representing from about 40 to 80 percent of said phosphates, based on the total phosphorus content.
Claim 7
Dependent Claim
31 words
The process of claim 1 wherein the micronutrient metal cation and the citric acid salt are incorporated in the phosphatic fertilizer solution in the form of a citrate chelated micronutrient metal.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein the water-soluble citric acid salt is incorporated in the phosphatic fertilizer solution prior to incorporation of the micronutrient metal cation.
Claim 9
Dependent Claim
28 words
The process of claim 1 wherein about 0.5 to 1.5 mol of citric acid salt is incorporated in the phosphatic fertilizer solution per mol of micronutrient metal cation.
References Cited (Backward Citations)
US2534787A
Cited
US2859104A
Cited
US3131048A
Cited
US3244500A
Cited
US3290140A
Cited
US3558300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |