US4617332A
Expired / Lapsed
US
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Phase change compositions
Assignee: University of Dayton
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Filing: 1984-08-31
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Granted: 1986-10-14
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Expires: 2004-08-31
Abstract
Abstract Compositions containing crystalline, long chain, alkyl hydrocarbons as phase change materials including cementitious compositions containing the alkyl hydrocarbons neat or in pellets or granules formed by incorporating the alkyl hydrocarbons in polymers or rubbers; and polymeric or elastomeric compositions containing alkyl hydrocarbons.
Inventors
- 👤 Ival O. Salyer
- 👤 Charles W. Griffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:01
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01; C04; C04B; C04B24/00; F; F28; F28D; F28D20/00; F28D20/02; F28D20/023; C04B2103/00; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A composition useful in thermal energy storage comprising a cementitious matrix material selected from the group consisting of hydraulic cement, gypsum, lime, and plaster of paris; and plurality of pellets or granules containing a crystalline straight chain alkyl hydrocarbon or a mixture of crystalline, straight chain, alkyl hydrocarbons, said hydrocarbon(s) having at least 14 carbon atoms and a heat of fusion greater than 30 cal/g., and said pellet or granule being formed by a process consisting essentially of dissolving or dispersing said alkyl hydrocarbon(s) in a polymer and grinding or cutting said polymer, said polymer being sufficiently compatible with said alkyl hydrocarbon such that said alkyl hydrocarbon can be dissolved or dispersed in said polymer.
Claim 2
Dependent Claim
115 words
A composition useful in thermal energy storage comprising a cementitious matrix material selected from the group consisting of hydraulic cement, gypsum, lime, and plaster of paris; and plurality of pellets or granules containing a crystalline straight chain alkyl hydrocarbon or a mixture of crystalline, straight chain, alkyl hydrocarbons, said hydrocarbon(s) having at least 14 carbon atoms and a heat of fusion greater than 30 cal/g., and said pellet or granule being formed by a process consisting essentially of dissolving or dispersing said alkyl hydrocarbon(s) in a polymer and grinding or cutting said polymer, said polymer being sufficiently compatible with said alkyl hydrocarbon such that said alkyl hydrocarbon can be dissolved or dispersed in said polymer.
Claim 3
Dependent Claim
44 words
The composition of claim 1, wherein said polymer is selected from the group consisting of natural rubber, butyl rubber, polybutadiene, co-poly(butadiene/styrene), co-poly(ethylene/propylene), nylons, polyesters, acrylate rubbers, methacrylate rubbers, polyvinyl alcohol, ethylene vinyl acetate co-polymers, polyvinyl acetate, vinyl chloride/vinyl acetate co-polymer, neoprene, and butadiene-acrylonitrile rubber.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein said polymer is natural or synthetic rubber.
Claim 5
Dependent Claim
15 words
The composition of claim 3, wherein said alkyl hydrocarbon(s) has 16 to 18 carbon atoms.
Claim 6
Dependent Claim
22 words
The composition of claim 3, wherein said alkyl hydrocarbon(s) has a melting point in the range of about 16° to 42° C.
Claim 7
Dependent Claim
21 words
The composition of claim 3, wherein said alkyl hydrocarbon(s) has a melting point in the range of 5° to 15° C.
Claim 8
Dependent Claim
21 words
The composition of claim 3, wherein said alkyl hydrocarbon(s) has a melting point in the range of 42° to 65° C.
Claim 9
Dependent Claim
19 words
The composition of claim 1, wherein said pellet or granule contains up to 50% by weight of said hydrocarbon.
Claim 10
Dependent Claim
20 words
The composition of claim 1, wherein said pellets or granules have a particle size of approximately 0.25 to 3.0 mm.
Claim 11
Dependent Claim
23 words
The composition of claim 2 wherein said rubber is selected from the group consisting of natural rubber, butyl rubber, E&DM, polybutadiene, and copoly(butadiene/styrene).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |