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US4349446A
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Glauber's salt heat storage compositions, crystal habit modifiers
Assignee: DELAWARE A NOT FOR PROFIT CORP OF, University of
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Filing: 1981-03-05
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Granted: 1982-09-14
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Expires: 2001-03-05
Abstract
Abstract Degradation of heat storage capacity in Glauber's salt heat storage compositions on thermal cycling is substantially decreased by addition of small amounts of crystal habit modifiers.
Inventors
- 👤 Stephen B. Marks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:06
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/063
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
59 words
In a Glauber's salt heat-of-fusion heat storage composition, the improvement comprising the addition of an amount of crystal habit modifier effective to limit crystal size, whereby degradation of heat storage capacity of the composition during thermal cycling is decreased, wherein the crystal habit modifier is selected from sodium hexametaphosphate, alkali metal or ammonium uncrosslinked polycarboxylates and surface active agents.
Claim 2
Dependent Claim
59 words
In a Glauber's salt heat-of-fusion heat storage composition, the improvement comprising the addition of an amount of crystal habit modifier effective to limit crystal size, whereby degradation of heat storage capacity of the composition during thermal cycling is decreased, wherein the crystal habit modifier is selected from sodium hexametaphosphate, alkali metal or ammonium uncrosslinked polycarboxylates and surface active agents.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein the crystal habit modifier is a surface active agent selected from polyethylene oxides and ethoxylated amines.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the crystal habit modifier is sodium hexametaphosphate.
Claim 5
Dependent Claim
9 words
The composition of claim 1 thickened with attapulgite clay.
Claim 6
Dependent Claim
8 words
The composition of claim 1 further containing borax.
Claim 7
Dependent Claim
12 words
The composition of claim 1 thickened with covalently crosslinked alkali metal polycarboxylate.
Claim 8
Dependent Claim
16 words
The composition of claim 1 wherein the crystal habit modifier is an alkali metal uncrosslinked polycarboxylate.
Claim 9
Dependent Claim
15 words
The composition of claim 1 wherein the crystal habit modifier is an ammonium uncrosslinked polycarboxylate.
Claim 10
Dependent Claim
21 words
The composition of claim 1 wherein the amount of crystal habit modifier is effective to limit crystal size to 150 microns.
Claim 11
Dependent Claim
46 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Weight
______________________________________
Attapulgite clay
7-10
Borax 2-6
Sodium sulfate 18-21
Water 23-33
______________________________________ in admixture with one or more crystal habit modifiers selected from sodium hexametaphosphate, alkali metal or ammonium uncrosslinked polycarboxylates, and surface active agents.
Claim 12
Dependent Claim
46 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Weight
______________________________________
Attapulgite clay
7-10
Borax 2-6
Sodium sulfate 18-21
Water 23-33
______________________________________ in admixture with one or more crystal habit modifiers selected from sodium hexametaphosphate, alkali metal or ammonium uncrosslinked polycarboxylates, and surface active agents.
Claim 13
Dependent Claim
16 words
A heat storage composition according to claim 10 wherein the crystal habit modifier is sodium hexametaphosphate.
Claim 14
Dependent Claim
21 words
A heat storage composition according to claim 10 wherein the crystal habit modifier is an uncrosslinked alkali metal or ammonium polyacrylate.
Claim 15
Dependent Claim
17 words
A heat storage composition according to claim 10 wherein the crystal habit modifier is uncrosslinked sodium polyacrylate.
Claim 16
Dependent Claim
21 words
A heat storage composition according to claim 10 wherein the crystal habit modifier is a surface active agent selected from polyethyleneoxides.
Claim 17
Dependent Claim
22 words
A heat storage composition according to claim 10 wherein the crystal habit modifier is a surface active agent selected from ethoxylated amines.
Claim 18
Dependent Claim
26 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Wt.
______________________________________
Attapulgite clay 9.3
Borax 2.6
Water 48.9
Sodium sulfate 38.4
Ammonium polyacrylate
0.9
______________________________________
Claim 19
Dependent Claim
26 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Wt.
______________________________________
Attapulgite clay 9.3
Borax 2.6
Water 48.9
Sodium sulfate 38.4
Ammonium polyacrylate
0.9
______________________________________
Claim 20
Dependent Claim
26 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Wt.
______________________________________
Attapulgite clay 9.4
Borax 2.6
Water 49.3
Sodium sulfate 38.7
Sodium hexametaphosphate
0.04
______________________________________
Claim 21
Dependent Claim
26 words
A heat storage composition consisting essentially of: ______________________________________
Parts by Wt.
______________________________________
Attapulgite clay 9.4
Borax 2.6
Water 49.3
Sodium sulfate 38.7
Sodium hexametaphosphate
0.04
______________________________________
References Cited (Backward Citations)
US2677664A
Cited
US3986969A
Cited
US4209312A
Cited
US4109702A
Cited
US4209413A
Cited
US4268405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |