Patent US4426307A successfully refreshed from Google Patents.
US4426307A
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Heat accumulative material
Assignee: Panasonic Holdings Corp
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Filing: 1982-07-06
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Granted: 1984-01-17
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Expires: 2002-07-06
Abstract
Abstract A novel latent heat accumulative material capable of accumulating heat in a temperature range best suited for the storage of solar energy was obtained by adding an organic compound or compounds such as urea [CO(NH2)2]to a system consisting of sodium acetate (CH3CO2Na) and water (H2O). Further addition of a crystal nucleus forming material or materials such as sodium pyrophosphate decahydrate (Na4P2O7.10H2O) to said composition could minimize supercooling and allowed a wider scope of application of the present heat accumulative material.
Inventors
- 👤 Takahiro Wada
- 👤 Ryoichi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:40
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
203 words
A heat accumulative material comprising a system containing three or more components, consisting of sodium acetate (CH 3 COONa) and water (H 2 O), mixed with at least one component selected from the group consisting of urea (CO(NH 2 ) 2 ), acetamide (CH 3 CONH 2 ), formamide (HCONH 2 ), glycine (NH 2 CH 2 COOH) and alanine (CH 3 (NH 2 )CHCOOH), wherein CH 3 COONa is contained in an amount within the range of 10 to 70% by weight, and H 2 O is contained in an amount within the range of 10 to 55% by weight, CO(NH 2 ) 2 is contained, if present, in an amount of 65% by weight or less (exclusive of 0%), CH 3 CONH 2 , if present, is contained in an amount of 80% by weight or less (exclusive of 0%), HCONH 2 , if present, is contained in an amount of 50% by weight or less (exclusive of 0%), NH 2 CH 2 COOH, if present, is contained in an amount of 40% by weight or less (exclusive of 0%), CH 3 (NH 2 )CHCOOH, if present, is contained in an amount of 35% by weight or less (exclusive of 0%).
Claim 2
Dependent Claim
203 words
A heat accumulative material comprising a system containing three or more components, consisting of sodium acetate (CH 3 COONa) and water (H 2 O), mixed with at least one component selected from the group consisting of urea (CO(NH 2 ) 2 ), acetamide (CH 3 CONH 2 ), formamide (HCONH 2 ), glycine (NH 2 CH 2 COOH) and alanine (CH 3 (NH 2 )CHCOOH), wherein CH 3 COONa is contained in an amount within the range of 10 to 70% by weight, and H 2 O is contained in an amount within the range of 10 to 55% by weight, CO(NH 2 ) 2 is contained, if present, in an amount of 65% by weight or less (exclusive of 0%), CH 3 CONH 2 , if present, is contained in an amount of 80% by weight or less (exclusive of 0%), HCONH 2 , if present, is contained in an amount of 50% by weight or less (exclusive of 0%), NH 2 CH 2 COOH, if present, is contained in an amount of 40% by weight or less (exclusive of 0%), CH 3 (NH 2 )CHCOOH, if present, is contained in an amount of 35% by weight or less (exclusive of 0%).
Claim 3
Dependent Claim
65 words
The heat accumulative material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with CO(NH 2 ) 2 to form a ternary composition, the amount of CH 3 COONa is within the range of 20 to 70% by weight and the amount of H 2 O is within the range of 15 to 50% by weight.
Claim 4
Dependent Claim
65 words
The heat accumulative material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with CH 3 CONH 2 to form a ternary composition, the amount of CH 3 COONa is within the range of 10 to 70% by weight and the amount of H 2 O is within the range of 10 to 50% by weight.
Claim 5
Dependent Claim
63 words
The heat accumulative material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with HCONH 2 to form a ternary composition the amount of CH 3 COONa is within the range of 30 to 70% by weight and the amount of H 2 O is within the range of 15 to 45% by weight.
Claim 6
Dependent Claim
66 words
The heat accumulating material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with NH 2 CH 2 COOH to form a ternary composition, the amount of CH 3 COONa is within the range of 30 to 70% by weight, and the amount of H 2 O is within the range of 20 to 50% by weight.
Claim 7
Dependent Claim
66 words
The heat accumulative material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with CH 3 (NH 2 )CHCOOH to form a ternary composition, the amount of CH 3 COONa is within the range of 35 to 70% by weight, and the amount of H 2 O is within the range of 20 to 55% by weight.
Claim 8
Dependent Claim
102 words
The heat accumulative material according to claim 1, wherein the system consisting of CH 3 COONa and H 2 O is mixed with CO(NH 2 ) 2 and NH 2 CH 2 COOH to form a quaternary composition, the amount of CH 3 COONa is within the range of 20 to 70% by weight, and the amount of H 2 O is within the range of 15 to 50% by weight, and the amount of NH 2 CH 2 COOH is within the range not greater than 30% by weight (exclusive of 0%) based on the total weight of the four components.
Claim 9
Dependent Claim
107 words
A heat accumulative material comprising a system consisting of CH 3 CO 2 Na and H 2 O, mixed with at least one compound selected from CO(NH 2 ) 2 , CH 3 CONH 2 , NH 2 CH 2 CO 2 H and CH 3 (NH 2 )CHCO 2 H, the composition being further added with at least one compound selected from sodium pyrophosphate (Na 4 P 2 O 7 ), trisodium monohydrogenpyrophosphate (Na 3 HP 2 O 7 ), disodium dihydrogenpyrophosphate (Na 2 H 2 P 2 O 7 ) and monosodium trihydrogenpyrophosphate (NaH 3 P 2 O 7 ) as crystal nucleus forming material.
Claim 10
Dependent Claim
107 words
A heat accumulative material comprising a system consisting of CH 3 CO 2 Na and H 2 O, mixed with at least one compound selected from CO(NH 2 ) 2 , CH 3 CONH 2 , NH 2 CH 2 CO 2 H and CH 3 (NH 2 )CHCO 2 H, the composition being further added with at least one compound selected from sodium pyrophosphate (Na 4 P 2 O 7 ), trisodium monohydrogenpyrophosphate (Na 3 HP 2 O 7 ), disodium dihydrogenpyrophosphate (Na 2 H 2 P 2 O 7 ) and monosodium trihydrogenpyrophosphate (NaH 3 P 2 O 7 ) as crystal nucleus forming material.
Claim 11
Dependent Claim
46 words
The heat accumulative material according to claim 8, wherein Na 4 P 2 O 7 is Na 4 P 2 O 7 .10H 2 O, and Na 2 H 2 P 2 O 7 is Na 2 H 2 P 2 O 7 .6H 2 O.
Claim 12
Dependent Claim
110 words
The heat accumulative material according to claim 8, wherein the amount of at least one compound selected from Na 4 P 2 O 7 , Na 3 HP 2 O 7 , Na 2 H 2 P 2 O 7 and NaH 3 P 2 O 7 mixed as crystal nucleus forming material is 40 parts by weight or less to 100 parts by weight of the composition comprising a CH 3 CO 2 Na-H 2 O system mixed with at least compound selected from CO(NH 2 ) 2 , CH 3 CONH 2 , NH 2 CH 2 CO 2 H and CH 3 (NH 2 )CHCO 2 H.
References Cited (Backward Citations)
US3559594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |