US3801338A
Expired / Lapsed
US
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Cement additives
Assignee: Fosroc AG
•
Filing: 1972-07-10
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Granted: 1974-04-02
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Expires: 1992-07-10
Abstract
Abstract An additive for hydraulic cement comprises a major amount of sodium nitrite in admixture with a minor amount of calcium formate, optionally with triethanolamine or sodium benzoate.
Inventors
- 👤 G Whitaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:27
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/04; C04B28/00; C04B28/02; C04B2111/00; C04B2111/20; C04B2111/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
13 words
An additive according to claim 1, which also contains triethanolamine or sodium benzoate.
Claim 2
Dependent Claim
26 words
An additive according to claim 2, wherein the triethanolamine or sodium benzoate is present in a proportion of up to 40% by weight of the additive.
Claim 3
Dependent Claim
22 words
An additive according to claim 2 wherein the triethanolamine or sodium benzoate comprises about 0.1 to 10% by weight of said additive.
Claim 4
Dependent Claim
8 words
An additive according to claim 1 and water.
Claim 5
Dependent Claim
23 words
An additive according to claim 5 in which the weight ratio of water to additive is in the range of 4:1 to 1:9.
Claim 6
Dependent Claim
21 words
An additive according to claim 6 wherein the weight ratio of water to additive is in the range 2:3 to 3:2.
Claim 7
Dependent Claim
19 words
An additive according to claim 1, and a dispersant to present the additive in liquid, paste or powder form.
Claim 8
Dependent Claim
16 words
An additive according to claim 1 comprising about 48% calcium formate, and about 52% sodium nitrite.
Claim 9
Dependent Claim
19 words
An additive according to claim 2 comprising about 19.5% calcium formate, about 77.9% sodium nitrite, and about 2.6% triethanolamine.
Claim 10
Dependent Claim
10 words
A cementitious composition incorporating an additive according to claim 1.
Claim 11
Dependent Claim
21 words
A cementitious composition according to claim 11, in which the weight of additive in the composition is up to about 20%.
Claim 12
Dependent Claim
22 words
A cementitious composition according to claim 12, in which the weight of additive in the composition is about 1% to about 6%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |