US4094692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing cement stone formed with aluminous binders
Assignee: Dyckerhoff GmbH
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Filing: 1977-01-06
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Granted: 1978-06-13
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Expires: 1997-01-06
Abstract
Abstract Process for stabilizing cement stone, formed with binders rich in aluminates by setting with water, against high elevated temperatures and high humidity which comprises adding calcium sulfite to the aluminous binder material prior to setting. In another embodiment of the invention the addition of calcium borate along with the calcium sulfite provided even greater stability both initially and over a period of time. Calcium sulfite formed as a by-product of the waste gas purification of furnaces is the main source of supply for purposes of this invention.
Inventors
- 👤 Eberhard Rauschenfels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:20
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B22/00; C04B22/0006; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
In a process wherein a cement stone-forming material is mixed with a binder rich in aluminates and with water, and is permitted to set to cement stone, the improvement which comprises adding calcium sulfite to said binder prior to said setting in an amount of at least 0.2 weight % up to about 10 weight % calculated as CaSO 3 based on the weight of said binder.
Claim 2
Dependent Claim
67 words
In a process wherein a cement stone-forming material is mixed with a binder rich in aluminates and with water, and is permitted to set to cement stone, the improvement which comprises adding calcium sulfite to said binder prior to said setting in an amount of at least 0.2 weight % up to about 10 weight % calculated as CaSO 3 based on the weight of said binder.
Claim 3
Dependent Claim
22 words
The process according to claim 1, wherein said calcium sulfite is added in an amount between about 0.2 and 5 weight %.
Claim 4
Dependent Claim
29 words
The process according to claim 1, wherein calcium borate is added in an amount between about 0.2 and 5.0 weight % based on the weight of said aluminous binder.
Claim 5
Dependent Claim
9 words
Cement stone produced by the process of claim 1.
Claim 6
Dependent Claim
22 words
The process according to claim 2, wherein said calcium sulfite is added in an amount between about 0.4 and 2 weight %.
Claim 7
Dependent Claim
22 words
The process accoding to claim 3, wherein said calcium borate is added in an amount between about 0.5 and 2 weight %.
Claim 8
Dependent Claim
20 words
The process according to claim 1, wherein said calcium sulfite is obtained as waste from purification of furnace flue gases.
Claim 9
Dependent Claim
39 words
An aluminous binder suitable for forming cement stone containing calcium sulfite waste obtained from purification of furnace flue gases in an amount of at least 0.2 weight % up to about 10 weight % calculated as CaSO 3 .
Claim 10
Dependent Claim
39 words
An aluminous binder suitable for forming cement stone containing calcium sulfite waste obtained from purification of furnace flue gases in an amount of at least 0.2 weight % up to about 10 weight % calculated as CaSO 3 .
References Cited (Backward Citations)
US3663252A
Cited
US3663286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |