US3719225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of storing heat
Assignee: HOOPER CHEM CORP
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Filing: 1969-02-13
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Granted: 1973-03-06
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Expires: 1989-02-13
Abstract
Abstract This invention relates to a method of transferring heat and heat storage composition, employing a substantially anhydrous composition of alkali metal hydroxide, alkali metal nitrate and one or more of several additives. The operating temperature is from 250*- 1,250* Fahrenheit.
Inventors
- 👤 M Mekjean
- 👤 J Sconce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:15
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A method of transferring heat so that it may be readily available for heat exchange purposes, comprising heating to a temperature of about 250* to about 1250* F. in a steel container, a substantially anhydrous heat storage medium comprising at least three components; a. a composition of at least 50 percent by weight of an alkali metal hydroxide; b. 1 to 49 percent by weight of an alkali metal nitrate; and, c. 0.1 to 30 percent by weight of an additive selected from the group consisting of iron, ferrites, MnO2, SnO2, TiO2 alkali metal and alkaline earth metal aluminates, chromates, carbonaTes, dichromates, manganates, permanganates, phosphates, pyrophosphates and mixtures thereof and subsequently withdrawing heat from said heat storage medium.
Claim 2
Independent Claim
118 words
A method of transferring heat so that it may be readily available for heat exchange purposes, comprising heating to a temperature of about 250* to about 1250* F. in a steel container, a substantially anhydrous heat storage medium comprising at least three components; a. a composition of at least 50 percent by weight of an alkali metal hydroxide; b. 1 to 49 percent by weight of an alkali metal nitrate; and, c. 0.1 to 30 percent by weight of an additive selected from the group consisting of iron, ferrites, MnO2, SnO2, TiO2 alkali metal and alkaline earth metal aluminates, chromates, carbonaTes, dichromates, manganates, permanganates, phosphates, pyrophosphates and mixtures thereof and subsequently withdrawing heat from said heat storage medium.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein the alkali metal hydroxide is sodium hydroxide, the alkali metal nitrate is sodium nitrate and the temperature employed ranges from 250* to 1,000* F.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein the components of the heat storage medium comprises at least about 85 percent sodium hydroxide, 5 to 10 percent sodium nitrate and 0.1 to about 5 percent sodium dichromate.
Claim 5
Dependent Claim
71 words
A heat storage composition comprising at least three components: a. a substantially anhydrous composition of at least 50 percent by weight alkali metal hydroxide, b. 1 to 49 percent by weight alkali metal nitrate and, c. 0.1 to 30 percent by weight of an additive selected from the group consisting of iron, ferrites, SnO2, TiO2, alkali metal and alkaline earth metal aluminates, chromates, dichromates, manganates, permanganates, phosphates, pyrophosphates and mixtures thereof.
Claim 6
Dependent Claim
71 words
A heat storage composition comprising at least three components: a. a substantially anhydrous composition of at least 50 percent by weight alkali metal hydroxide, b. 1 to 49 percent by weight alkali metal nitrate and, c. 0.1 to 30 percent by weight of an additive selected from the group consisting of iron, ferrites, SnO2, TiO2, alkali metal and alkaline earth metal aluminates, chromates, dichromates, manganates, permanganates, phosphates, pyrophosphates and mixtures thereof.
Claim 7
Dependent Claim
23 words
The composition of claim 4 comprising at least about 85 percent by weight sodium hydroxide, and about 5 to 10 percent sodium nitrate.
Claim 8
Dependent Claim
42 words
The composition of claim 4 which comprises about 90 percent sodium hydroxide, about 8 percent sodium nitrate and about 1 percent of an additive selected from the group consisting of SnO2, alkali metal and alkaline earth metal chromates, dichromates and mixtures thereof.
Claim 9
Dependent Claim
31 words
The method of claim 1 wherein the composition employed comprises by weight about 88% NaOH, about 8% NaNO3, about 0.2% MnO2, about 0.8% KOH, about 1.5% NaCl and about 1.5% Na2CO3.
Claim 10
Dependent Claim
30 words
The composition of claim 4 comprising by weight about 83% NaOH, about 8% NaNO3, about 5% K4P2O7, about 0.2% MnO2, about 0.8% KOH, about 1.5% NaCl and about 1.5% Na2CO3.
Claim 11
Dependent Claim
54 words
The method of claim 1 comprising a substantially anhydrous mixture of at least about 85 percent by weight sodium hydroxide, 5 to 10 percent by weight sodium nitrate and 0.1 to 5 percent by weight of an additive selected from the group consisting of alkali metal carbonate, MnO2, alkali metal dichromate and mixtures thereof.
References Cited (Backward Citations)
US2556387A
Cited
US2677664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |