Patent US3709209A successfully refreshed from Google Patents.
US3709209A
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US
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Heat accumulator
Assignee: US Philips Corp
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Filing: 1971-08-24
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Granted: 1973-01-09
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Expires: 1991-08-24
Abstract
Abstract A heat accumulator which comprises a eutectic mixture of LiF and fluoride having a melting point of less than 850* C of the group constituted by sodium fluoride and/or magnesium fluoride. The mixture may additionally comprise potassium fluoride and/or calcium fluoride. The heat accumulator is suitable for supplying thermal energy to a hot-gas engine and for use in heat accumulating ovens.
Inventors
- 👤 J Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:13
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G1/055; C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063; C09K5/08; C09K5/10; C09K5/12; F02G1/057; F22; F22B; F22B1/00; F22B1/02; F22B1/028; F28; F28D; F28D20/00; F28D20/02; F28D20/021; F02G2254/00; F02G2254/30; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
A heat accumulator as claimed in claim 1, characterized in that the inorganic material consists of a eutectic mixture of lithium fluoride and sodium fluoride.
Claim 2
Dependent Claim
25 words
A heat accumulator as claimed in claim 1, characterized in that the inorganic material consists of a eutectic mixture of lithium fluoride and magnesium fluoride.
Claim 3
Dependent Claim
27 words
A heat accumulator as claimed in claim 1, characterized in that the inorganic material consists of a eutectic mixture of lithium fluoride, sodium fluoride and calcium fluoride.
Claim 4
Dependent Claim
27 words
A heat accumulator as claimed in claim 1, characterized in that the inorganic material consists of a eutectic mixture of lithium fluoride, sodium fluoride and magnesium fluoride.
Claim 5
Dependent Claim
27 words
A heat accumulator as claimed in claim 1, characterized in that the inorganic material consists of a eutectic mixture of lithium fluoride, magnesium fluoride and potassium fluoride.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |