US3930832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of corrosive action of zinc-containing fertilizer solutions
Assignee: FERTILIZER INDUSTRIES Inc
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Filing: 1975-04-21
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Granted: 1976-01-06
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Expires: 1995-04-21
Abstract
Abstract Corrosion of carbon steel by an aqueous solution of zinc nitrate, ammonium nitrate, and urea is inhibited by incorporating therein an effective amount of ammonium thiosulfate. The solution is particularly useful in correcting zinc deficiencies in plants when applied as a foliar spray.
Inventors
- 👤 James Earl Sansing, Jr.
- 👤 Joseph Novotny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:05
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/182; C05; C05C; C05C1/00; Y; Y10; Y10S; Y10S71/00; Y10S71/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
80 words
A process of preparing a zinc-containing fertilizer solution of low corrosiveness toward carbon steel which comprises incorporating in an aqueous zinc nitrate-ammonium nitrate-urea solution containing at least 8 percent by weight zinc nitrate, at least 14 percent by weight ammonium nitrate, at least 10 percent by weight urea, and the balance substantially consisting of water, about 0.1 to 5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate, and potassium thiosulfate.
Claim 2
Dependent Claim
80 words
A process of preparing a zinc-containing fertilizer solution of low corrosiveness toward carbon steel which comprises incorporating in an aqueous zinc nitrate-ammonium nitrate-urea solution containing at least 8 percent by weight zinc nitrate, at least 14 percent by weight ammonium nitrate, at least 10 percent by weight urea, and the balance substantially consisting of water, about 0.1 to 5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate, and potassium thiosulfate.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the thiosulfate compound is ammonium thiosulfate.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the thiosulfate compound is sodium thiosulfate.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the thiosulfate compound is potassium thiosulfate.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein the solution is diluted with sufficient water to provide a foliar spray solution containing about 0.1 to 0.2 weight percent of zinc nitrate.
Claim 7
Dependent Claim
86 words
A process for controlling corrosiveness to carbon steel of a solution of zinc nitrate, ammonium nitrate, and urea in water, said solution containing 12 to 20 percent by weight of zinc nitrate, 21 to 30 percent by weight of ammonium nitrate, 15 to 23 percent by weight of urea, and the balance consisting essentially of water, comprising incorporating in said solution about 0.1 to 0.5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate and potassium thiosulfate.
Claim 8
Dependent Claim
86 words
A process for controlling corrosiveness to carbon steel of a solution of zinc nitrate, ammonium nitrate, and urea in water, said solution containing 12 to 20 percent by weight of zinc nitrate, 21 to 30 percent by weight of ammonium nitrate, 15 to 23 percent by weight of urea, and the balance consisting essentially of water, comprising incorporating in said solution about 0.1 to 0.5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate and potassium thiosulfate.
Claim 9
Dependent Claim
12 words
The process of claim 6 wherein the thiosulfate compound is ammonium thiosulfate.
Claim 10
Dependent Claim
12 words
The process of claim 6 wherein the thiosulfate compound is sodium thiosulfate.
Claim 11
Dependent Claim
12 words
The process of claim 6 wherein the thiosulfate compound is potassium thiosulfate.
Claim 12
Dependent Claim
29 words
The process of claim 6 wherein the solution is diluted with sufficient water to provide a foliar spray solution containing about 0.1 to 0.2 weight percent of zinc nitrate.
Claim 13
Dependent Claim
76 words
As a new composition of matter of low corrosiveness to carbon steel, an aqueous zinc nitrate-ammonium nitrate-urea solution consisting essentially of at least 8 percent by weight zinc nitrate, at least 14 percent by weight ammonium nitrate, at least 10 percent by weight urea, about 0.1 to 5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate, and potassium thiosulfate, and the balance substantially consisting of water.
Claim 14
Dependent Claim
76 words
As a new composition of matter of low corrosiveness to carbon steel, an aqueous zinc nitrate-ammonium nitrate-urea solution consisting essentially of at least 8 percent by weight zinc nitrate, at least 14 percent by weight ammonium nitrate, at least 10 percent by weight urea, about 0.1 to 5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate, and potassium thiosulfate, and the balance substantially consisting of water.
Claim 15
Dependent Claim
12 words
The composition of claim 11 wherein the thiosulfate compound is ammonium thiosulfate.
Claim 16
Dependent Claim
12 words
The composition of claim 11 wherein the thiosulfate compound is sodium thiosulfate.
Claim 17
Dependent Claim
12 words
The composition of claim 11 wherein the thiosulfate compound is potassium thiosulfate.
Claim 18
Dependent Claim
20 words
The composition of claim 11 wherein sufficient ammonia is incorporated to adjust the pH of the composition to pH 4-5.
Claim 19
Dependent Claim
85 words
As a new composition of matter of low corrosiveness to carbon steel, a solution of zinc nitrate, ammonium nitrate, and urea in water, said solution consisting essentially of 12 to 20 percent by weight of zinc nitrate, 21 to 30 percent by weight of ammonium nitrate, 15 to 23 percent by weight of urea, 0.1 to 0.5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate and potassium thiosulfate, and the balance consisting essentially of water.
Claim 20
Dependent Claim
85 words
As a new composition of matter of low corrosiveness to carbon steel, a solution of zinc nitrate, ammonium nitrate, and urea in water, said solution consisting essentially of 12 to 20 percent by weight of zinc nitrate, 21 to 30 percent by weight of ammonium nitrate, 15 to 23 percent by weight of urea, 0.1 to 0.5 percent by weight of a water-soluble thiosulfate compound selected from the group consisting of ammonium thiosulfate, sodium thiosulfate and potassium thiosulfate, and the balance consisting essentially of water.
Claim 21
Dependent Claim
12 words
The composition of claim 16 wherein the thiosulfate compound is ammonium thiosulfate.
Claim 22
Dependent Claim
12 words
The composition of claim 16 wherein the thiosulfate compound is sodium thiosulfate.
Claim 23
Dependent Claim
12 words
The composition of claim 16 wherein the thiosulfate compound is potasium thiosulfate.
Claim 24
Dependent Claim
20 words
The composition of claim 16 wherein sufficient ammonia is incorporated to adjust the pH of the composition to pH 4-5.
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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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |