US4234332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous fertilizer solutions containing dicyandiamide
Assignee: Evonik Operations GmbH
•
Filing: 1979-01-23
•
Granted: 1980-11-18
•
Expires: 1999-01-23
Abstract
Abstract Aqueous solutions of commonly used fertilizers which also contain dicyandiamide, in an amount to provide at least 10% by weight of dicyandiamide nitrogen, are effective nitrification inhibitors and have an improved capacity to dissolve micronutrients to form solutions of improved micronutrient stability.
Inventors
- 👤 Horst Michaud
- 👤 Georg Rieder
- 👤 Josef Seeholzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:53
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/146; C05; C05C; C05C1/00; C05C7/00; Y; Y10; Y10S; Y10S71/00; Y10S71/902
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
44 words
A fertilizer composition which is an aqueous solution of a nitrogen-containing compound selected from urea, ammonium nitrate, ammonia and mixtures thereof and dicyandiamide in an amount such that the dicyandiamide nitrogen is 10% or more by weight of the total nitrogen of said solution.
Claim 2
Dependent Claim
44 words
A fertilizer composition which is an aqueous solution of a nitrogen-containing compound selected from urea, ammonium nitrate, ammonia and mixtures thereof and dicyandiamide in an amount such that the dicyandiamide nitrogen is 10% or more by weight of the total nitrogen of said solution.
Claim 3
Dependent Claim
34 words
A composition according to claim 1 wherein said aqueous solution has dissolved therein in addition to said nitrogen-containing compound and said dicyandiamide, a compound selected from ammonium sulfate, water-soluble phosphates and water-soluble potassium salts.
Claim 4
Dependent Claim
13 words
A fertilizer composition according to claim 1 wherein said nitrogen-containing compound is urea.
Claim 5
Dependent Claim
14 words
A fertilizer composition according to claim 1 wherein said nitrogen-containing compound is ammonium nitrate.
Claim 6
Dependent Claim
26 words
A method of making the fertilizer solution of claim 1 which comprises preparing an aqueous solution of said nitrogen-containing compound and thereafter dissolving crystalline dicyandiamide therein.
Claim 7
Dependent Claim
46 words
A fertilizer composition consisting essentially of an aqueous solution of at least one commonly used nitrogen-containing fertilizer compound selected from urea, ammonium nitrate, ammonium sulfate and ammonia, said solution having micronutrients dissolved therein and containing a stabilizing amount of dicyandiamide to maintain said micronutrients in solution.
Claim 8
Dependent Claim
46 words
A fertilizer composition consisting essentially of an aqueous solution of at least one commonly used nitrogen-containing fertilizer compound selected from urea, ammonium nitrate, ammonium sulfate and ammonia, said solution having micronutrients dissolved therein and containing a stabilizing amount of dicyandiamide to maintain said micronutrients in solution.
Claim 9
Dependent Claim
17 words
A fertilizer composition according to claim 6 wherein said solution has a phosphorus-containing fertilizer compound dissolved therein.
Claim 10
Dependent Claim
17 words
A fertilizer composition according to claim 6 wherein said solution has a potassium-containing fertilizer compound dissolved therein.
Claim 11
Dependent Claim
28 words
A fertilizer composition according to claim 6 wherein the dicyandiamide nitrogen in said solution is at least about 10% by weight of the total nitrogen in said solution.
Claim 12
Dependent Claim
30 words
A fertilizer composition according to claim 6 wherein the dicyandiamide nitrogen in said solution is from about 10% to about 35% by weight of the total nitrogen in said solution.
Claim 13
Dependent Claim
13 words
A fertilizer composition according to claim 6 wherein said micronutrients are metal salts.
Claim 14
Dependent Claim
22 words
A fertilizer composition according to claim 6 wherein said micronutrients comprise from about 0.1 to about 1.5% by weight of said solution.
Claim 15
Dependent Claim
40 words
In an aqueous micronutrient-containing nitrogenous fertilizer solution containing at least one fertilizer compound selected from urea, ammonium nitrate, ammonium sulfate and ammonia, the improvement which comprises a stabilizing amount of dicyandiamide in said solution to prevent precipitation of said micronutrients.
Claim 16
Dependent Claim
40 words
In an aqueous micronutrient-containing nitrogenous fertilizer solution containing at least one fertilizer compound selected from urea, ammonium nitrate, ammonium sulfate and ammonia, the improvement which comprises a stabilizing amount of dicyandiamide in said solution to prevent precipitation of said micronutrients.
Claim 17
Dependent Claim
25 words
A fertilizer solution according to claim 13 wherein the dicyandiamide nitrogen is at least about 10% by weight of the total nitrogen of the solution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |