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US4849017A
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Magnetic refrigerant for magnetic refrigeration
Assignee: Toshiba Corp
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Filing: 1986-01-30
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Granted: 1989-07-18
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Expires: 2006-01-30
Abstract
Abstract A magnetic refrigerant for magnetic refrigeration which comprises a sintered body containing at least one of rare earth elements selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of at least one of aluminum, nickel and cobalt. This invention provides sintered magnetic bodies which are suited for use as magnetic refrigerants, and also provides significant contribution to the performance improvement of magnetic refrigerators and to the materialization of regenerator-type magnetic refrigerants.
Inventors
- 👤 Masashi Sahashi
- 👤 Koichiro Inomata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/012; C; C22; C22C; C22C28/00; F; F25; F25B; F25B21/00; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of aluminum, wherein the content of said rare earth element is from 70 to 75% by weight.
Claim 2
Dependent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of aluminum, wherein the content of said rare earth element is from 70 to 75% by weight.
Claim 3
Dependent Claim
78 words
The magnetic refrigerant according to claim 1, wherein said sintered body comprises (a) at least about 50% by weight and not more than about 75% by weight of at least one heavy rare earth elements selected from the group consisting of gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium and (b) up to about 25% by weight of at least one rare earth element from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, and yttrium.
Claim 4
Dependent Claim
20 words
The magnetic refrigerant according to claim 1, wherein said sintered body has a density of 5 g/cm 3 or more.
Claim 5
Dependent Claim
19 words
The magnetic refrigerant according to claim 1, wherein the balance further contains at least one of nickel and cobalt.
Claim 6
Dependent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of nickel, wherein the content of said rare earth element is from 55 to 65% by weight.
Claim 7
Dependent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of nickel, wherein the content of said rare earth element is from 55 to 65% by weight.
Claim 8
Dependent Claim
78 words
The magnetic refrigerant according to claim 5, wherein said sintered body comprises (a) at least about 35% by weight and not more than about 65% by weight of at least one heavy rare earth elements selected from the group consisting of gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium and (b) up to about 35% by weight of at least one rare earth element from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, and yttrium.
Claim 9
Dependent Claim
20 words
The magnetic refrigerant according to claim 5, wherein said sintered body has a density of 8 g/cm 3 or more.
Claim 10
Dependent Claim
19 words
The magnetic refrigerant according to claim 5 wherein said balance further contains at least one of cobalt and aluminum.
Claim 11
Dependent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of cobalt, wherein the content of said rare earth element is from 55 to 65% by weight.
Claim 12
Dependent Claim
64 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of cobalt, wherein the content of said rare earth element is from 55 to 65% by weight.
Claim 13
Dependent Claim
77 words
The magnetic refrigerant according to claim 9, wherein said sintered body comprises (a) at least about 35% by weight and not more than 65% by weight of at least one heavy rare earth elements selected from the group consisting of gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium and (b) up to about 30% by weight of at least one rare earth element from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, and yttrium.
Claim 14
Dependent Claim
20 words
The magnetic refrigerant according to claim 9, wherein said sintered body has a density of 7 g/cm 3 or more.
Claim 15
Dependent Claim
19 words
The magnetic refrigerant according to claim 9, wherein said balance further contains at least one of aluminum and nickel.
Claim 16
Dependent Claim
18 words
The magnetic refrigerant according to claim 9, wherein said group consists of praseodymium, dysprosium, holmium, erbium and thulium.
Claim 17
Dependent Claim
63 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of cobalt, wherein the content of said rare earth element is from 55 to 65% by weight.
Claim 18
Dependent Claim
63 words
A magnetic refrigerant for magnetic refrigeration which comprises a sintered body consisting essentially of at least one rare earth element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of cobalt, wherein the content of said rare earth element is from 55 to 65% by weight.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |