US4072020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soil treatment method
Assignee: Revertex South Africa Pty Ltd
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Filing: 1976-03-10
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Granted: 1978-02-07
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Expires: 1996-03-10
Abstract
Abstract The invention relates to a method of aggregating sands to an appreciable depth so that they can be used, inter alia, for runways, roadways and the like, the method comprising applying a polymer emulsion to a body of sand in a large volume of water containing a stabilizer which ensures distribution of the polymer throughout a substantial depth and prevention of migration of the polymer as the water evaporates, thereby forming bonds between adjacent sand particles, and allowing the sand to dry.
Inventors
- 👤 Richard T. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
E; E02; E02D; E02D3/00; E02D3/12; C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/20; E01; E01C; E01C7/00; E01C7/36; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A method of aggregating sands to a depth of at least 3 cm to form a consolidated load-bearing crust, comprising flooding the surface of the sand with more than about 5 liters per square meter of sand, with water containing an effective amount less than about 3% by dry weight of a water-insoluble polymer emulsion selected from the group consisting of polyvinylacetate, vinylacetate-acrylic copolymer and acrylic-acrylic copolymer, which polymer has been polymerized with a colloid stabilizer as the main stabilizer in the polymer chain, said colloid stabilizer being selected from the group consisting of cellulose, polyvinyl alcohol, gum acacia and gum arabic, said amount being effective to aggregate the sand to said depth, the composition of the polymer emulsion being such that the polymer is distributed throughout the desired depth and does not migrate as the water evaporates, thereby forming bonds between adjacent sand particles.
Claim 2
Independent Claim
145 words
A method of aggregating sands to a depth of at least 3 cm to form a consolidated load-bearing crust, comprising flooding the surface of the sand with more than about 5 liters per square meter of sand, with water containing an effective amount less than about 3% by dry weight of a water-insoluble polymer emulsion selected from the group consisting of polyvinylacetate, vinylacetate-acrylic copolymer and acrylic-acrylic copolymer, which polymer has been polymerized with a colloid stabilizer as the main stabilizer in the polymer chain, said colloid stabilizer being selected from the group consisting of cellulose, polyvinyl alcohol, gum acacia and gum arabic, said amount being effective to aggregate the sand to said depth, the composition of the polymer emulsion being such that the polymer is distributed throughout the desired depth and does not migrate as the water evaporates, thereby forming bonds between adjacent sand particles.
References Cited (Backward Citations)
US2745815A
Cited
GB906470A
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US3077054A
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US3690107A
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US3677014A
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GB1373020A
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |