Patent US4670056A successfully refreshed from Google Patents.
US4670056A
Expired / Lapsed
US
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Material for sealing borehole walls
Assignee: Individual
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Filing: 1984-11-09
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Granted: 1987-06-02
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Expires: 2004-11-09
Abstract
Abstract Ground milk-of-lime grit with a maximum grain size of 0.75 mm is mixed with calcium or magnesium chloride and water to form a pumpable mixture which sets into an acid soluble mass only after about 1.5 to 4 hours.
Inventors
- 👤 Hermann Alsdorf
- 👤 Armin Dittmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:59
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045; C04; C04B; C04B28/00; C04B28/30; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
44 words
A material for sealing borehole walls, comprising ground milk-of-lime grit with maximum grain size of 0.75 mm and a grain component <0.1 mm between 55 and 65% by weight; a chloride selected from the group consisting of calcium chloride and magnesium chloride; and water.
Claim 2
Dependent Claim
44 words
A material for sealing borehole walls, comprising ground milk-of-lime grit with maximum grain size of 0.75 mm and a grain component <0.1 mm between 55 and 65% by weight; a chloride selected from the group consisting of calcium chloride and magnesium chloride; and water.
Claim 3
Dependent Claim
42 words
The material according to claim 1, comprising an intimate mixture of the ground milk-of-lime grit, and the chloride and water in the form of a concentrated aqueous calcium chloride or magnesium chloride solution in a weight ratio of about 4 : 5.
Claim 4
Dependent Claim
17 words
The material according to claim 2, wherein the chloride solution has a concentration of 30-40% by weight.
Claim 5
Dependent Claim
44 words
The material according to claim 1, further comprising waste materials with hydraulic properties in quanties of 10 to 30% by weight of the solid component, which do not substantially impair acid solubility of a solid reaction product formed from the material and the water.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |