Patent US5085790A successfully refreshed from Google Patents.
US5085790A
Expired / Lapsed
US
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Phase change materials and use thereof
Assignee: Individual
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Filing: 1990-06-05
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Granted: 1992-02-04
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Expires: 2010-06-05
Abstract
Abstract The invention relates to a heat transfer composition comprising at least two members selected from the group consisting of: a) strontium hydroxide octahydrato; b) lithium hydroxide monohydrate; and c) non-hydrate forming chloride or nitrates, wherein for a mixture comprising a) and b) the composition contains from about 40 to about 60 mol % of one hydroxide hydrate relative to the other hydroxide hydrate and for a composition containing c) and a) or b), the composition contains from about 5 to about 40% by weight of c) based on the total weight of hydroxide hydrate. These mixtures have high caloric values and are useful for a variety of applications such as preheaters for car engine cooling water systems.
Inventors
- 👤 Gerd Hormansdorfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:23
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A heat transfer composition comprising at least two members selected from the group consisting of: a) strontium hydroxide octahydrate; b) lithium hydroxide monohydrate; and c) non-hydrate forming chlorides or nitrates, wherein for a mixture comprising a) and b) the composition contains from about 40 to about 60 mol % of one hydroxide hydrate relative to the other hydroxide hydrate and for a composition containing c) and a) or b), the composition contains from about 5 to about 40% by weight of total c) based on the total weight of hydroxide hydrate.
Claim 2
Dependent Claim
91 words
A heat transfer composition comprising at least two members selected from the group consisting of: a) strontium hydroxide octahydrate; b) lithium hydroxide monohydrate; and c) non-hydrate forming chlorides or nitrates, wherein for a mixture comprising a) and b) the composition contains from about 40 to about 60 mol % of one hydroxide hydrate relative to the other hydroxide hydrate and for a composition containing c) and a) or b), the composition contains from about 5 to about 40% by weight of total c) based on the total weight of hydroxide hydrate.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 comprising from about 5 to about 25% of sodium or potassium chloride.
Claim 4
Dependent Claim
31 words
A composition according to claim 1 comprising component c) wherein from about 40 to about 60 mol % of the total chloride content is a mixture of sodium and potassium chloride.
Claim 5
Dependent Claim
12 words
A composition according to claim 1 comprising up to 5% of water.
Claim 6
Dependent Claim
26 words
A composition according to claim 1 comprising from about 20 to about 40%, based on the total weight of hydroxide hydrate, of sodium or potassium nitrate.
Claim 7
Dependent Claim
31 words
A composition according to claim 1 comprising from about 55 to about 65 mol % of strontium hydroxide octahydrate and from about 40 to about 35 mol % of potassium chloride.
Claim 8
Dependent Claim
30 words
A preheater for an automobile engine cooling system comprising a composition according to claim 1 which has a melting temperature in the range between about 60° to about 80° C.
Claim 9
Dependent Claim
24 words
The method for transferring heat to a material comprising bringing said material in contact with a surface heated by the composition of claim 1.
Claim 10
Dependent Claim
10 words
The method of claim 8 wherein said material is food.
Claim 11
Dependent Claim
20 words
The method for protecting a heat-sensitive device comprising maintaining said device in heat-transfer contact with the composition of claim 1.
Claim 12
Dependent Claim
94 words
Phase change material based on strontium hydroxide octahydrate or lithium hydroxide monohydrate, where to one of these two hydroxide hydrates at least one salt selected from the group consisting of non-hydrate forming chlorides, non-hydrate forming nitrates and the other hydroxide hydrate is admixed, the added quantities of the other hydroxide hydrate laying in the range of 40-60 mol % related to the quantity of the first hydroxide hydrate, and where the added quantities of salt make out a part of 5 to 40 percent of weight, related to the total quantity of hydroxide hydrate.
Claim 13
Dependent Claim
94 words
Phase change material based on strontium hydroxide octahydrate or lithium hydroxide monohydrate, where to one of these two hydroxide hydrates at least one salt selected from the group consisting of non-hydrate forming chlorides, non-hydrate forming nitrates and the other hydroxide hydrate is admixed, the added quantities of the other hydroxide hydrate laying in the range of 40-60 mol % related to the quantity of the first hydroxide hydrate, and where the added quantities of salt make out a part of 5 to 40 percent of weight, related to the total quantity of hydroxide hydrate.
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |