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Patent US4257814A successfully refreshed from Google Patents.
US4257814A
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Accelerating agents for accelerating hardening of cement
Assignee: Coal Industry Patents Ltd
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Filing: 1979-06-26
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Granted: 1981-03-24
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Expires: 1999-06-26
Abstract
Abstract An agent for accelerating hardening of cement for use in an underground mining installation employing concrete-like packs including run-of-mine coal. The agent comprises by weight one and a half parts triethanolamine, five parts sodium carbonate and one part potassium carbonate. Too rapid setting of quick setting cement is avoided by the agent because a slurry of cement in water is mixed with a slurry of agent and run-of-mine coal in bentonite in a mixer immediately before being added to a pack so that setting cement does not occur in pipes leading to the mixer.
Inventors
- 👤 William H. Kellet
- 👤 Peter S. Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
C; C04; C04B; C04B40/00; C04B40/06; C04B40/0658; C04B28/00; C04B28/02; C04B2103/00; C04B2103/10; C04B2103/12; C04B2111/00; C04B2111/00474; C04B2111/00724; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A method of at least partially filling a cavity in an underground mine which method comprises the steps of (a) where required, defining said cavity using shuttering, (b) charging to said cavity a first aqueous slurry containing a hydraulic cement and concurrently charging and mixing with said first aqueous slurry a second aqueous slurry containing an agent for accelerating hardening of the hydraulic cement and (c) permitting the mixed slurries to harden into a supportive concrete-like material in the cavity.
Claim 2
Independent Claim
80 words
A method of at least partially filling a cavity in an underground mine which method comprises the steps of (a) where required, defining said cavity using shuttering, (b) charging to said cavity a first aqueous slurry containing a hydraulic cement and concurrently charging and mixing with said first aqueous slurry a second aqueous slurry containing an agent for accelerating hardening of the hydraulic cement and (c) permitting the mixed slurries to harden into a supportive concrete-like material in the cavity.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1, wherein the second slurry contains a dirt aggregate.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 1, wherein the first slurry contains a dirt aggregate.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 2, wherein the dirt aggregate comprises run-of-mine coal.
Claim 6
Dependent Claim
19 words
A method as claimed in claim 1 wherein the agent comprises triethanolamine and at least one alkali metal carbonate.
Claim 7
Dependent Claim
17 words
A method as claimed in claim 5, wherein the agent comprises triethanolamine, sodium carbonate and potassium carbonate.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 6 wherein the agent comprises by weight one and a half part triethanolamine, five parts sodium carbonate and one part potassium carbonate.
References Cited (Backward Citations)
US3759044A
Cited
US3801338A
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US3799787A
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US3973978A
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US4045236A
Cited
US4059963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |