Patent US4082561A successfully refreshed from Google Patents.
US4082561A
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Method for execution of quick hardening cement
Assignee: Denka Co Ltd
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Filing: 1976-04-20
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Granted: 1978-04-04
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Expires: 1996-04-20
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 10:33
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/32; C04B7/323; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A quick hardening agent for cement consisting essentially of a mixture of an amorphous 12 CaO.7Al 2 O 3 and an anhydrous gypsum in a weight ratio of 1:0.5 to 1:15.
Claim 2
Dependent Claim
31 words
A quick hardening agent for cement consisting essentially of a mixture of an amorphous 12 CaO.7Al 2 O 3 and an anhydrous gypsum in a weight ratio of 1:0.5 to 1:15.
Claim 3
Dependent Claim
18 words
A quick hardening cement containing 10-50% by weight of the quick hardening agent for cement of claim 1.
Claim 4
Dependent Claim
23 words
The quick hardening cement as claimed in claim 2, wherein the proportion of the quick hardening agent for cement is 20-30% by weight.
Claim 5
Dependent Claim
35 words
The quick hardening cement as claimed in claim 2, further containing an organic carboxylic acid or a salt thereof and a metal carbonate in an amount of 0.01-5% by weight based on the cement weight.
Claim 6
Dependent Claim
35 words
The quick hardening cement as claimed in claim 3, further containing an organic carboxylic acid or a salt thereof and a metal carbonate in an amount of 0.01-5% by weight based on the cement weight.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |