Patent US4424290A successfully refreshed from Google Patents.
US4424290A
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US
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Filtrate reducer additive for swelling clay grouts and cement-swelling clay grouts
Assignee: FRANCAISE DES BENTONITES ET DERIVES Ste
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Filing: 1981-08-13
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Granted: 1984-01-03
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Expires: 2001-08-13
Abstract
Abstract An additive for swelling clay grouts and cement-swelling clay grouts, intended to reduce the filtrate, lower and stabilize viscosity, retard rigidification time, limit sweating and sedimentation of the solid constituents, is an alkaline ethylenic acid polymer and/or copolymer, with molecular weight between 500 and 20,000, but preferably between 1000 and 6000. This additive is especially advantageous in the fields of civil engineering, building, public works and drilling.
Inventors
- 👤 Jacky Rousset
- 👤 Roger P. Chavrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:20
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C09; C09K; C09K17/00; C09K17/40; C09K17/42; C09K17/48; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
47 words
An additive for swelling clay grouts and cement-swelling clay grouts that reduces the filtrate, lowers and stabilizes the viscosity, retards rigidification time, limits sweating and the sedimentation of the solid constituents, comprising an alkaline ethylenic acid polymer and/or copolymer with a molecular weight between 3000 and 20,000.
Claim 2
Dependent Claim
47 words
An additive for swelling clay grouts and cement-swelling clay grouts that reduces the filtrate, lowers and stabilizes the viscosity, retards rigidification time, limits sweating and the sedimentation of the solid constituents, comprising an alkaline ethylenic acid polymer and/or copolymer with a molecular weight between 3000 and 20,000.
Claim 3
Dependent Claim
23 words
An additive as in claim 1 wherein the molecular weight of the alkaline ethylenic acid polymer and/or copolymer is between 3000 and 6000.
Claim 4
Dependent Claim
25 words
An additive as in claim 1 or 2 formed by the polymerization and/or copolymerization of acrylic methacrylic, itaconic, maleic, methallyl sulfonic acids, and their esters.
Claim 5
Dependent Claim
29 words
An additive as in claim 3 wherein the alkaline polymer and/or copolymer is a sodium, potassium, ammonium, or lithium salt and is neutralized by primary, secondary or tertiary amines.
Claim 6
Dependent Claim
22 words
An additive as in claim 4 wherein the polymer and/or copolymer is formed by radical polymerization and/or copolymerization in a hydroalcoholic medium.
Claim 7
Dependent Claim
31 words
An additive as in claim 5 wherein polymerization and/or copolymerization is carried out in the presence of an alcohol selected from the group consisting of methanol, ethanol, propanol, isopropanol and butanol.
Claim 8
Dependent Claim
34 words
An additive as in claim 6 introduced into swelling clay grouts or cement swelling clay grouts comprising a swelling clay mass at 0.01-10% by weight of dry material relative to the swelling clay mass.
Claim 9
Dependent Claim
25 words
An additive as in claim 7 added to the swelling clay mass at any stage of its manufacture, prior to the formation of the grout.
Claim 10
Dependent Claim
19 words
An additive as in claim 8 added to the preparation water of swelling clay gels or cement-swelling clay grouts.
Claim 11
Dependent Claim
18 words
An additive as in claim 4 added to the swelling clay gel or cement-swelling clay grout previously prepared.
Claim 12
Dependent Claim
22 words
Swelling clay grouts or cement-swelling clay grouts as in claim 1 comprising 5-600 kg/m3 of swelling clays and 40-2000 kg/m3 of cements.
Claim 13
Dependent Claim
30 words
An additive as in claim 6 introduced into swelling clay grouts or cement-swelling clay grouts at 0.5 to 2% by weight of dry material relative to the swelling clay mass.
Claim 14
Dependent Claim
14 words
Swelling clay grouts as in claim 1 including a 25-400 kg/m3 of swelling clays.
Claim 15
Dependent Claim
11 words
Cement-swelling clay grouts as in claim 1 including 80-400 kg/m3 cements.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |