Patent US4025329A successfully refreshed from Google Patents.
US4025329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate urea-formaldehyde fertilizer composition and process
Assignee: OM Scott and Sons Co
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Filing: 1975-12-04
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Granted: 1977-05-24
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Expires: 1995-12-04
Abstract
Abstract A controlled-release particulate fertilizer composition is prepared by compacting and agglomerating particles of a foamed urea-formaldehyde condensation product into a sheet having a specific gravity of at least 1.40, the molar ratio of urea to formaldehyde in said condensation product being from 1.3:1 to 2.4:1, comminuting the compacted sheet into particulate form and separating and recovering the particles having a size of more than 30 mesh, substantially all said recovered particles having a ratio of largest to smallest particle of less than 3:1. The fertilizer is characterized by a high degree of uniformity from particle to particle in both composition and size, relatively high particle density and a combination of both quick initial and long lasting nutrient release.
Inventors
- 👤 Harvey Maurice Goertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:20
CPC Classifications
C; C05; C05B; C05B7/00; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A controlled release particulate fertilizer composition, said composition comprising particles having a specific gravity greater than 1.40, each of said particles containing a urea-formaldehyde condensation product as a nitrogen nutrient source in which the molar ratio of urea to formaldehyde in the condensation product is from 1.3:1 to 2.4:1, and at least one additional solid plant nutrient or pesticide trapped with each of said urea-formaldehyde particles, said particles being substantially uniform from particle to particle in both composition and size, the ratio of the largest to smallest of substantially all said particles being less than 3:1, and substantially no particles having a size of smaller than 30 mesh, said composition characterized in that the initial release of nutrient occurs quickly and extends for a period of at least six weeks.
Claim 2
Dependent Claim
130 words
A controlled release particulate fertilizer composition, said composition comprising particles having a specific gravity greater than 1.40, each of said particles containing a urea-formaldehyde condensation product as a nitrogen nutrient source in which the molar ratio of urea to formaldehyde in the condensation product is from 1.3:1 to 2.4:1, and at least one additional solid plant nutrient or pesticide trapped with each of said urea-formaldehyde particles, said particles being substantially uniform from particle to particle in both composition and size, the ratio of the largest to smallest of substantially all said particles being less than 3:1, and substantially no particles having a size of smaller than 30 mesh, said composition characterized in that the initial release of nutrient occurs quickly and extends for a period of at least six weeks.
Claim 3
Dependent Claim
15 words
The composition of claim 1 in which the additional solid material is a plant nutrient.
Claim 4
Dependent Claim
12 words
The composition of claim 2 in which the plant nutrient is urea.
Claim 5
Dependent Claim
16 words
The composition of claim 2 in which the plant nutrient is a plant available iron source.
Claim 6
Dependent Claim
14 words
The composition of claim 2 in which the plant nutrient is an ammoniated phosphate.
Claim 7
Dependent Claim
13 words
The composition of claim 1 which the additional solid material is a fungicide.
Claim 8
Dependent Claim
14 words
The composition of claim 1 in which the additional solid material is a herbicide.
Claim 9
Dependent Claim
22 words
The composition of claim 1 in which the ratio of urea to formaldehyde in the condensation product is from 1.5:1 to 2.1:1.
Claim 10
Dependent Claim
21 words
The composition of claim 1 in which substantially all said particles have a size ranging from 30 to 5/16 inch mesh.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |