US4272391A
Expired / Lapsed
US
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Hydrated Mg(NO3)2 reversible phase change compositions
Assignee: Dow Chemical Co
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Filing: 1979-11-02
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Granted: 1981-06-09
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Expires: 1999-11-02
Abstract
Abstract A reversible liquid solid phase change composition comprising hydrated Mg(NO 3 ) 2 and one of the group of MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , and/or CaCO 3 , added to the composition in an effective amount to suppress supercooling of the Mg(NO 3 ) 2 liquid phase.
Inventors
- 👤 George A. Lane
- 👤 Harold E. Rossow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:47
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063; Y; Y10; Y10S; Y10S165/00; Y10S165/902
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
62 words
A reversible liquid/solid phase change composition comprising hydrated Mg(NO 3 ) 2 and as a nucleating additive, one or more of MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , or CaCO 3 , added to the composition in an amount effective to suppress average supercooling of the Mg(NO 3 ) 2 liquid phase to about 2° C. or less.
Claim 2
Dependent Claim
62 words
A reversible liquid/solid phase change composition comprising hydrated Mg(NO 3 ) 2 and as a nucleating additive, one or more of MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , or CaCO 3 , added to the composition in an amount effective to suppress average supercooling of the Mg(NO 3 ) 2 liquid phase to about 2° C. or less.
Claim 3
Dependent Claim
31 words
The composition of claim 1, wherein the hydrated Mg(NO 3 ) 2 consists of about 57.8 weight percent Mg(NO 3 ) 2 and the balance is water to 100 weight percent.
Claim 4
Dependent Claim
10 words
The composition of claim 1 hermetically contained within encapsulating means.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein the additive comprises not greater than about 2.0 weight percent MgO.
Claim 6
Dependent Claim
19 words
The composition of claim 1 wherein the additive comprises not more than about 2.0 weight percent Mg(OH) 2 .
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein the additive comprises not greater than about 2.0 weight percent MgCO 3 .
Claim 8
Dependent Claim
17 words
The composition of claim 1 wherein the additive comprises not greater than about 2.0 weight percent CaO.
Claim 9
Dependent Claim
19 words
The composition of claim 1 wherein the additive comprises not greater than about 2.0 weight percent Ca(OH) 2 .
Claim 10
Dependent Claim
19 words
The composition of claim 1 wherein the additive comprises not greater than about 2.0 weight percent CaCO 3 .
Claim 11
Independent Claim
62 words
A method of preparing a hydrated Mg(NO 3 ) 2 composition of suppressed supercooling properties, comprising admixing uniformly in such composition, one or more of MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , or CaCO 3 , in an amount effective to suppress average supercooling of the Mg(NO 3 ) 2 liquid phase to about 2° C. or less.
Claim 12
Independent Claim
62 words
A method of preparing a hydrated Mg(NO 3 ) 2 composition of suppressed supercooling properties, comprising admixing uniformly in such composition, one or more of MgO, Mg(OH) 2 , MgCO 3 , CaO, Ca(OH) 2 , or CaCO 3 , in an amount effective to suppress average supercooling of the Mg(NO 3 ) 2 liquid phase to about 2° C. or less.
Claim 13
Dependent Claim
31 words
The method of claim 10, wherein the hydrated Mg(NO 3 ) 2 consists of about 57.8 weight percent Mg(NO 3 ) 2 and the balance is water to 100 weight percent.
Claim 14
Dependent Claim
9 words
The method of claim 10 using the additive MgO.
Claim 15
Dependent Claim
11 words
The method of claim 10 using the additive Mg(OH) 2 .
Claim 16
Dependent Claim
11 words
The method of claim 10 using the additive MgCO 3 .
Claim 17
Dependent Claim
9 words
The method of claim 10 using the additive CaO.
Claim 18
Dependent Claim
11 words
The method of claim 10 using the additive Ca(OH) 2 .
Claim 19
Dependent Claim
11 words
The method of claim 10 using the additive CaCO 3 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |