US4474595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizer product and process for making and using it
Assignee: NATIONS FINANCIAL CAPITAL Corp AS SUCCESSOR AGENT
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Filing: 1983-03-10
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Granted: 1984-10-02
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Expires: 2003-03-10
Abstract
Abstract A process for making controlled release fertilizer product containing an increased amount of sustained-release nitrogen includes the step of mixing a partly water soluble thermoplastic binder, and urea-formaldehyde condensate and a pH modifier. The amount of pH modifier should be sufficient to bring the pH of the shaped fertilizer product to the range from about 6 to about 12. The mixture is subjected to such conditions including temperature and pressure so as to produce a shaped fertilizer product. The resulting shaped fertilizer product includes approximately the same amount of sustained-release nitrogen as the urea-formaldehyde condensate in the mixture.
Inventors
- 👤 William T. Lawhon, Jr.
- 👤 Henry M. Grotta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:02
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02; C05C9/005
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
104 words
A process for producing a shaped controlled release fertilizer product which provides improved sustained release of nitrogen, said process comprising: (a) mixing a water soluble thermoplastic binder, urea-formaldehyde condensate having a urea to formaldehyde mole ratio in the range from about 1.25 to about 1.4, a plasticizer, and a pH modifier to produce a mixture; and (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier in said mixture being sufficient to bring the pH in the shaped fertilizer product to the range from about 6 to about 12.
Claim 2
Dependent Claim
104 words
A process for producing a shaped controlled release fertilizer product which provides improved sustained release of nitrogen, said process comprising: (a) mixing a water soluble thermoplastic binder, urea-formaldehyde condensate having a urea to formaldehyde mole ratio in the range from about 1.25 to about 1.4, a plasticizer, and a pH modifier to produce a mixture; and (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier in said mixture being sufficient to bring the pH in the shaped fertilizer product to the range from about 6 to about 12.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said water soluble thermoplastic binder is poly(vinyl alcohol).
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said pH modifier is magnesium oxide.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein said pH modifier is hydrated lime.
Claim 6
Dependent Claim
15 words
The process of claim 2 wherein said water soluble thermoplastic binder is hydroxy propyl cellulose.
Claim 7
Dependent Claim
12 words
The process of claim 3 wherein said pH modifier is hydrated lime.
Claim 8
Dependent Claim
12 words
The process of claim 3 wherein said pH modifier is magnesium oxide.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein said binder is GELVATOL and the urea-formaldehyde condensate is NITROFORM.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein plant nutrients are included in the mixture.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein said pH modifier is hydrated lime.
Claim 12
Dependent Claim
12 words
The process of claim 8 wherein said pH modifier is magnesium oxide.
Claim 13
Dependent Claim
14 words
The process of claim 1 wherein an inert filler is added in step (a).
Claim 14
Dependent Claim
13 words
The process of claim 1 wherein plant nutrients are added in step (a).
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said pH modifier is hydrated lime.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein said pH modifier is magnesium oxide.
Claim 17
Dependent Claim
100 words
A process for producing a shaped controlled release fertilizer product which provides improved sustained release of nitrogen, said process comprising: (a) mixing a partly water soluble thermoplastic binder, a partly water soluble urea formaldehyde condensate, a plasticizer and a pH modifier to produce a mixture; and (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier being sufficient so that the amount of slow release nitrogen is substantially the same as the amount of such nitrogen in the urea formaldehyde used to produce said mixture.
Claim 18
Dependent Claim
100 words
A process for producing a shaped controlled release fertilizer product which provides improved sustained release of nitrogen, said process comprising: (a) mixing a partly water soluble thermoplastic binder, a partly water soluble urea formaldehyde condensate, a plasticizer and a pH modifier to produce a mixture; and (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier being sufficient so that the amount of slow release nitrogen is substantially the same as the amount of such nitrogen in the urea formaldehyde used to produce said mixture.
Claim 19
Dependent Claim
56 words
The process of claim 16 wherein the urea formaldehyde condensate has a urea to formaldehyde ratio in the range from about 1.25 to about 1.4 and wherein the amount of said pH modifier in said mixture is sufficient to bring the pH in the shaped fertilizer product to the range from about 6 to about 12.
Claim 20
Dependent Claim
12 words
The process of claim 17 wherein said pH modifier is hydrated lime.
Claim 21
Dependent Claim
35 words
The process of claim 17 wherein the amount of said pH modifier in said mixture is sufficient to bring the pH in the shaped fertilizer product to the range from about 6.5 to about 8.5.
Claim 22
Dependent Claim
12 words
The process of claim 19 wherein said pH modifier is hydrated lime.
Claim 23
Dependent Claim
12 words
The process of claim 16 wherein said pH modifier is hydrated lime.
Claim 24
Dependent Claim
48 words
A controlled release fertilizer product which provides a sustained release of nitrogen, said product comprising: a partly water soluble urea-formaldehyde condensate; and a water soluble thermoplastic binder a plasticizer and a pH modifier, said fertilizer product having the pH in the range from about 6 to about 12.
Claim 25
Dependent Claim
48 words
A controlled release fertilizer product which provides a sustained release of nitrogen, said product comprising: a partly water soluble urea-formaldehyde condensate; and a water soluble thermoplastic binder a plasticizer and a pH modifier, said fertilizer product having the pH in the range from about 6 to about 12.
Claim 26
Dependent Claim
11 words
The fertilizer of claim 22 wherein the binder is poly(vinyl alcohol).
Claim 27
Dependent Claim
22 words
The fertilizer of claim 22 wherein the poly(vinyl alcohol) is GELVATOL, the urea formaldehyde is NITROFORM and said plasticizer is CARBOWAX 400.
Claim 28
Independent Claim
120 words
A method for providing nutrients to a plant at a controlled rate, including providing sustained release of nitrogen, said method comprising: (a) mixing a water-soluble thermoplastic binder, urea-formaldehyde condensate having a urea to formaldehyde mole ratio in the range from about 1.25 to abuut 1.4, a plasticizer, and a pH modifier to produce a mixture; (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier in said mixture being sufficient to bring the pH in the shaped fertilizer product to the range from about 6 to about 12; and (c) inserting into the soil in the vicinity of said plant's roots the shaped fertilizer product.
Claim 29
Independent Claim
120 words
A method for providing nutrients to a plant at a controlled rate, including providing sustained release of nitrogen, said method comprising: (a) mixing a water-soluble thermoplastic binder, urea-formaldehyde condensate having a urea to formaldehyde mole ratio in the range from about 1.25 to abuut 1.4, a plasticizer, and a pH modifier to produce a mixture; (b) subjecting said mixture to such conditions including temperature and pressure so as to produce a shaped fertilizer product, the amount of said pH modifier in said mixture being sufficient to bring the pH in the shaped fertilizer product to the range from about 6 to about 12; and (c) inserting into the soil in the vicinity of said plant's roots the shaped fertilizer product.
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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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |