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US3973978A
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Method for execution of quick hardening cement
Assignee: Denka Co Ltd
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Filing: 1974-06-17
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Granted: 1976-08-10
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Expires: 1994-06-17
Abstract
Abstract A method for working quick hardening cements comprising preparing (A) a composition comprising a cement paste, mortar or concrete and (B) a composition comprising a powder or suspension composition of calcium aluminate and inorganic sulfate, mixing the composition (A) and the composition (B) and quickly executing the mixture immediately after the admixture.
Inventors
- 👤 Koji Nakagawa
- 👤 Kenkiti Hirano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:59
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B7/00; C04B7/32; C04B7/323
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A method for working quick hardening cements comprising preparing (a) a composition selected from the group consisting of a cement paste, mortar and concrete and (b) 10-50% by weight based on cement content of composition (a) of a composition selected from the group consisting of a powder composition of calcium aluminate and inorganic sulfate and a suspension composition of calcium aluminate and inorganic sulfate wherein the proportion of calcium aluminate: inorganic sulfate is 1:0.1 to 5 parts by weight, mixing the composition (a) and the composition (b) and casting the mixture immediately after the admixture.
Claim 2
Independent Claim
95 words
A method for working quick hardening cements comprising preparing (a) a composition selected from the group consisting of a cement paste, mortar and concrete and (b) 10-50% by weight based on cement content of composition (a) of a composition selected from the group consisting of a powder composition of calcium aluminate and inorganic sulfate and a suspension composition of calcium aluminate and inorganic sulfate wherein the proportion of calcium aluminate: inorganic sulfate is 1:0.1 to 5 parts by weight, mixing the composition (a) and the composition (b) and casting the mixture immediately after the admixture.
Claim 3
Dependent Claim
24 words
The method as claimed in claim 1, wherein said composition (b) contains an organic carboxylic acid or a salt thereof and a metal carbonate.
Claim 4
Dependent Claim
20 words
The method as claimed in claim 1, wherein said calcium aluminate is an amorphous calcium aluminate or calcium haloaluminate. k
Claim 5
Dependent Claim
19 words
The method as claimed in claim 3, wherein said calcium aluminate is an amorphous 12CaO.7Al 2 O 3 .
Claim 6
Dependent Claim
26 words
The method as claimed in claim 1, wherein the proportion of calcium aluminate: inorganic sulfate in said composition (b) is about 1:0.5 to 1:1.5 by weight.
Claim 7
Dependent Claim
31 words
The method as claimed in claim 1, wherein the amount of said composition (b) is about 20 to 30% by weight on the basis of the cement content of composition (a).
Claim 8
Dependent Claim
19 words
The method as claimed in claim 2, wherein said calcium aluminate is an amorphous calcium aluminate or calcium haloaluminate.
Claim 9
Dependent Claim
19 words
The method as claimed in claim 7, wherein said calcium aluminate is an amorphous 12CaO.7Al 2 O 3 .
Claim 10
Dependent Claim
26 words
The method as claimed in claim 2, wherein the proportion of calcium aluminate: inorganic sulfate in said composition (b) is about 1:0.5 to 1:1.5 by weight.
Claim 11
Dependent Claim
31 words
The method as claimed in claim 2, wherein the amount of said composition (b) is about 20 to 30% by weight on the basis of the cement content of composition (a).
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |