US3748115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plant nutrient products
Assignee: Shell USA Inc
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Filing: 1971-11-16
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Granted: 1973-07-24
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Expires: 1991-11-16
Abstract
Abstract This invention relates to novel plant nutrient products which not only provide a slow and gradual release of water soluble plant nutrients to the agricultural soil, but also afford a means by which the rate of release of plant nutrients from the product can be controlled at a substantially constant (linear) rate throughout the life of the product.
Inventors
- 👤 H Sommer
- 👤 R Larsen
- 👤 L Wittsell
- 👤 Laren G Mc
- 👤 E Feichtmeir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:50
CPC Classifications
C; C05; C05G; C05G5/00; C05G5/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
A plant nutrient product of claim 1 wherein the matrix is formed in the shape of a right cylinder.
Claim 2
Dependent Claim
76 words
A plant nutrient product of claim 2 wherein the hydrophobic matrix is made up of asphalt and one from the group consisting of; a. 0 to 20 percent petroleum wax; b. 0 to 20 percent cutting stock; c. 0 to 20 percent of a mixture of petroleum wax and cutting stock; d. 0 to 50 percent blowing flux and e. 0 to 75 percent of gilsonite; all percentages being based on the weight of the asphalt.
Claim 3
Dependent Claim
24 words
A plant nutrient product of claim 2 wherein the partial coating covers the cylinder in a manner such that the one end remains uncoated.
Claim 4
Dependent Claim
23 words
A plant nutrient formulation of claim 2 wherein the partial coating covers the cylinder in a manner such that both ends remain uncoated.
Claim 5
Dependent Claim
32 words
A plant nutrient formulation of claim 2 wherein the partial coating covers the cylinder in a manner such that a strip on the periphery running lengthwise, perpendicular to the ends, remains uncoated.
Claim 6
Dependent Claim
26 words
A plant nutrient product of claim 3 wherein the water-insoluble, impervious partial coating is of the same composition as the material utilized in the hydrophobic matrix.
Claim 7
Dependent Claim
28 words
A plant nutrient product of claim 6 wherein the cylindrical formulation is from 3/4 to 6 inches in length and from 3/4 to 2 1/2 inches in diameter.
References Cited (Backward Citations)
US3276857A
Cited
US3219433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |