Patent US4082533A successfully refreshed from Google Patents.
US4082533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated controlled-release product
Assignee: D M Scott & Sons Co
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Filing: 1973-06-27
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Granted: 1978-04-04
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Expires: 1993-06-27
Abstract
Abstract A coated product providing for the controlled release of an active constituent, such as a fertilizer, over a long period of time comprising a core of an active constituent and two water insoluble coatings. The first coating surrounding the core contains masonry cement, and the second coating preferably contains a blend of one or more thermoplastic polymers and a wax. The coated product provides an unusually long lasting fertilizer at relatively low cost.
Inventors
- 👤 Lawrence S. Wittenbrook
- 👤 Edwin L. Scheiderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:34
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/005; C05G; C05G5/00; C05G5/30; C05G5/37
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
45 words
A coated product providing for the release of a water soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement.
Claim 2
Dependent Claim
45 words
A coated product providing for the release of a water soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement.
Claim 3
Dependent Claim
15 words
The coated product of claim 1 in which the second coating is a wax-polymer blend.
Claim 4
Dependent Claim
22 words
The product of claim 2 in which the second coating is a blend of at least one thermoplastic resin and a wax.
Claim 5
Dependent Claim
24 words
The product of claim 3 in which the second coating is a blend of a thermoplastic interpolymer, a thermoplastic hydrocarbon resin and a wax.
Claim 6
Dependent Claim
14 words
The product of claim 4 in which the copolymer is an ethylene-vinyl acetate copolymer.
Claim 7
Dependent Claim
27 words
The product of claim 4 in which the second coating contains by weight 20 - 35% interpolymer, 5 - 15% hydrocarbon resin and 50 - 75% wax.
Claim 8
Dependent Claim
30 words
The product of claim 2 in which the second coating is a blend of an ethylene-vinyl acetate copolymer, a thermoplastic hydrocarbon resin and a predominate amount of a paraffin wax.
Claim 9
Dependent Claim
11 words
The product of claim 1 in which the fertilizer is urea.
Claim 10
Dependent Claim
13 words
The product of claim 1 in which the first coating is masonry cement.
Claim 11
Dependent Claim
13 words
The product of claim 9 in which the first coating also contains bentonite.
Claim 12
Dependent Claim
21 words
The product of claim 1 in which the first coating is 3 - 12% of the total weight of the product.
Claim 13
Dependent Claim
22 words
The product of claim 1 in which the second coating is from 5 - 25% of the total weight of the product.
Claim 14
Dependent Claim
50 words
A controlled-release fertilizer product comprising a core containing a water-soluble fertilizer in particulate form, a first coating surrounding said core containing masonry cement, a second coating surrounding said first coating comprising a blend of a copolymer of an olefin and an unsaturated ester, a thermoplastic hydrocarbon resin and a wax.
Claim 15
Dependent Claim
50 words
A controlled-release fertilizer product comprising a core containing a water-soluble fertilizer in particulate form, a first coating surrounding said core containing masonry cement, a second coating surrounding said first coating comprising a blend of a copolymer of an olefin and an unsaturated ester, a thermoplastic hydrocarbon resin and a wax.
Claim 16
Dependent Claim
37 words
The product of claim 13 in which the first coating contains masonry cement and bentonite and the second coating is a blend of a copolymer of ethylene and vinyl acetate, a thermoplastic hydrocarbon resin and paraffin wax.
Claim 17
Dependent Claim
42 words
A process for the preparation of a controlled-release product comprising coating a core comprising a water soluble fertilizer in particulate form with a finely divided mixture containing cement and applying to said coated core a second coating of a water insoluble material.
Claim 18
Dependent Claim
42 words
A process for the preparation of a controlled-release product comprising coating a core comprising a water soluble fertilizer in particulate form with a finely divided mixture containing cement and applying to said coated core a second coating of a water insoluble material.
Claim 19
Dependent Claim
14 words
The process of claim 15 in which the second coating is a wax-polymer blend.
Claim 20
Dependent Claim
21 words
The process of claim 15 in which the first coating is applied as a powder by dusting on to the core.
Claim 21
Dependent Claim
19 words
The process of claim 15 in which the core is wetted with water before application of the first coating.
Claim 22
Dependent Claim
22 words
The process of claim 15 in which the core is heated to melt its outer surface before application of the first coating.
Claim 23
Dependent Claim
20 words
The process of claim 15 in which the core and first coat are heated before application of the second coating.
Claim 24
Dependent Claim
63 words
A coated product providing for the release of a water-soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement and bentonite, the second coating comprising a blend of a thermoplastic interpolymer, a thermoplastic hydrocarbon resin and a wax.
Claim 25
Dependent Claim
63 words
A coated product providing for the release of a water-soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement and bentonite, the second coating comprising a blend of a thermoplastic interpolymer, a thermoplastic hydrocarbon resin and a wax.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |