US3596759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reclaiming constituents of concrete
Assignee: ALFRED B KING CO
•
Filing: 1969-10-07
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Granted: 1971-08-03
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Expires: 1989-10-07
Abstract
Abstract A process for reclaiming sand and gravel from a fluid concrete mixture, comprising adding water to the mixture to form a slurry and transferring the slurry to at least one gravel screen for separating the gravel therefrom and allowing the sand and cement slurry to pass therethrough. The sand and cement slurry is then transferred to a sand screen for separating the sand from the slurry and permitting the cement slurry to flow through The cement is separated from the slurry by settling in a basin or tank and the clear water is recycled so that it may be added to the fluid concrete mixture being processed, or the water may be discarded. The gravel and sand are transferred by conveyor from their respective screens to storage bins for use in preparing concrete.
Inventors
- 👤 John P King
- 👤 James M Kowolenko Jr
- 👤 Ralph K Safford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:39
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/06; B03B9/061; B03B9/063; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A process in accordance with claim 1, further including recycling the water removed from the cement slurry to the fluid concrete mixture being processed.
Claim 2
Dependent Claim
31 words
A process in accordance with claim 2, further including washing the gravel on said gravel screen and transmitting the gravel by conveyor means from the gravel screen to a storage bin.
Claim 3
Dependent Claim
31 words
A process in accordance with claim 3, further including washing the sand on said sand screen and transmitting the sand by conveyor means from the sand screen to a storage bin.
Claim 4
Dependent Claim
55 words
A process in accordance with claim 1, further comprising passing the cement slurry over a settling basin having baffles therein whereby the slurry travels at a slow speed over a long path in the basin to permit the cement to settle to the bottom of the basin before the water passes out of the basin.
Claim 5
Dependent Claim
44 words
A process in accordance with claim 5, wherein a portion of the clear water from the settling basin is recycled to the fluid concrete mixture introduced into the process, and the remainder of the clear water is passed from the settling basin for disposal.
Claim 6
Dependent Claim
45 words
A process in accordance with claim 1, wherein said separating means comprises a settling tank and the cement slurry is kept therein for a time sufficient to permit the cement to separate from the water to form a clear water layer and a cement layer.
Claim 7
Dependent Claim
42 words
A process in accordance with claim 7, further comprising removing the cement layer from the settling tank by gravity through a valve in the tank and recycling the clear water in the tank to the fluid concrete mixture introduced into the process.
Claim 8
Dependent Claim
62 words
A process in accordance with claim 1, wherein said separating means comprises first and second settling tanks and the cement slurry is alternately passed to each said settling tank so that the cement may settle out and, simultaneously, recycling the clear water from the settling tank, in which the cement has settled out, to the fluid concrete mixture introduced into the process.
Claim 9
Dependent Claim
50 words
A process in accordance with claim 1, wherein separating means comprises a mechanical separator which continuously separates the cement from the water, the clear water formed in the separator is recycled to the fluid concrete mixture introduced into the process, and the cement separated out in the separator is dumped.
Claim 10
Dependent Claim
27 words
A process in accordance with claim 1, wherein a portion of the cement slurry is transmitted to a storage tank for use in the formation of concrete.
Claim 11
Dependent Claim
31 words
A process in accordance with claim 1, wherein a portion of the cement slurry is transmitted to a concrete mixing unit for use in the formation of a new concrete mixture.
References Cited (Backward Citations)
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US1829544A
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |