US4650523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement accelerating agent
Assignee: Taiheiyo Cement Corp
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Filing: 1985-05-17
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Granted: 1987-03-17
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Expires: 2005-05-17
Abstract
Abstract Initial setting, initial adhesion and long-term stability of mortar and concrete can be improved by use of a cement accelerating agent comprising (1) calcined alunite, a carbonate and lime, (2) calcined alunite, a carbonate and an aluminate, or (3) calcined alunite, a carbonate, an aluminate and lime.
Inventors
- 👤 Masatsune Kikuchi
- 👤 Satoru Matsui
- 👤 Hiroshi Omori
- 👤 Masao Shimoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:43
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A cement accelerating agent comprising 50 to 84 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 15 to 30 weight % of an alkali metal carbonate and 1 to 25 weight % of lime.
Claim 2
Dependent Claim
43 words
A cement accelerating agent comprising 50 to 84 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 15 to 30 weight % of an alkali metal carbonate and 1 to 25 weight % of lime.
Claim 3
Dependent Claim
46 words
A cement accelerating agent comprising 50 to 94 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 5 to 30 weight % of an alkali metal carbonate and 1 to 30 weight % of an alkali metal aluminate.
Claim 4
Dependent Claim
46 words
A cement accelerating agent comprising 50 to 94 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 5 to 30 weight % of an alkali metal carbonate and 1 to 30 weight % of an alkali metal aluminate.
Claim 5
Dependent Claim
53 words
A cement accelerating agent comprising 50 to 89.9 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 5 to 30 weight % of an alkali metal carbonate, 5 to 30 weight % of an alkali metal aluminate and 0.1 to 25 weight % of lime.
Claim 6
Dependent Claim
53 words
A cement accelerating agent comprising 50 to 89.9 weight % of calcined alunite, prepared by calcining alunite at a temperature between 350° and 750° C., 5 to 30 weight % of an alkali metal carbonate, 5 to 30 weight % of an alkali metal aluminate and 0.1 to 25 weight % of lime.
Claim 7
Dependent Claim
16 words
A cement accelerating agent according to claim 1 wherein the lime is quicklime or slaked lime.
Claim 8
Dependent Claim
16 words
A cement accelerating agent according to claim 3 wherein the lime is quicklime or slaked lime.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |