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US4292189A
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Thermal energy storage composition comprising sodium sulfate decahydrate; sodium carbonate decahydrate; and sodium tetraborate decahydrate
Assignee: Arkema Inc
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Filing: 1979-07-30
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Granted: 1981-09-29
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Expires: 1999-07-30
Abstract
Abstract A thermal energy storage composition is disclosed that stores heat upon melting and releases heat upon solidification. It is composed of a mixture of sodium sulfate decahydrate, sodium carbonate decahydrate, sodium borate decahydrate and a thickening agent. Its good heat transfer characteristics, relatively high latent heat of fusion, low cost, and favorable melting point allow this material to be particularly useful for space heating applications.
Inventors
- 👤 Johnson C. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:14
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A composition for storing and releasing thermal energy consisting essentially of the following ingredients expressed in percent by weight: sodium sulfate decahydrate--about 30-50%, sodium carbonate decahydrate--about 50-60%, sodium borate decahydrate--about 1-10% and a thickening agent--about 0.5 to 8%, wherein the composition melts and freezes within the range of 21° to 24° centrigrade.
Claim 2
Dependent Claim
52 words
A composition for storing and releasing thermal energy consisting essentially of the following ingredients expressed in percent by weight: sodium sulfate decahydrate--about 30-50%, sodium carbonate decahydrate--about 50-60%, sodium borate decahydrate--about 1-10% and a thickening agent--about 0.5 to 8%, wherein the composition melts and freezes within the range of 21° to 24° centrigrade.
Claim 3
Dependent Claim
33 words
The composition of claim 1 in which the sodium sulfate decahydrate is present at 40%, the sodium carbonate decahydrate is present at 55% and the sodium borate decahydrate is present at 5 percent.
Claim 4
Dependent Claim
19 words
The composition of claim 1 in which the thickening agent is fumed silica at a concentration of 3 percent.
References Cited (Backward Citations)
US2677664A
Cited
US3720198A
Cited
JPS5090583A
Cited
US3986969A
Cited
JPS5196788A
Cited
US4037650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |