Patent US3841107A successfully refreshed from Google Patents.
US3841107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic refrigeration
Assignee: United States Department of the Navy
•
Filing: 1973-06-20
•
Granted: 1974-10-15
•
Expires: 1993-06-20
Abstract
Abstract A magnetic refrigeration system includes thermal transfer means comprising a serial arrangement of magnetocaloric elements and a source of magnetic field. The serial arrangement comprises a material having a large, negative magnetocaloric effect which cools upon application of a magnetic field; a paramagnetic material in abutting relationship therewith which cools upon removal of a magnetic field; and end elements functioning as thermal switches. The magnetic field is caused to move along the serial arrangement, permitting heat to be transferred from a heat source to a heat sink. Cascading of the serial arrangements increases the refrigeration effect.
Inventors
- 👤 A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:15
CPC Classifications
F; F25; F25B; F25B21/00; F25B2321/00; F25B2321/002; F25B2321/0021; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
A magnetic refrigeration system comprising: a first magnetocaloric thermal conductor; a second thermal conductor serially connected to saId first thermal conductor; a source of magnetic field, said field movable along said first and said second thermal conductors to induce a thermal flow in said conductors; and thermal switching means adapted to regulate the thermal flow through said conductors.
Claim 2
Dependent Claim
58 words
A magnetic refrigeration system comprising: a first magnetocaloric thermal conductor; a second thermal conductor serially connected to saId first thermal conductor; a source of magnetic field, said field movable along said first and said second thermal conductors to induce a thermal flow in said conductors; and thermal switching means adapted to regulate the thermal flow through said conductors.
Claim 3
Dependent Claim
29 words
The magnetic refrigeration system of claim 1 wherein said first thermal conductor is of a material having a negative magnetocaloric effect which cools upon application of a magnetic field.
Claim 4
Dependent Claim
26 words
The refrigeration system of claim 2 wherein said thermal switching means is of a material completing a thermal flow path upon application of a magnetic field.
Claim 5
Dependent Claim
32 words
The refrigeration system of claim 3 wherein there are at least two thermal switches, one each thermally connected to the free ends of said first thermal conductor and said second thermal conductor.
Claim 6
Dependent Claim
29 words
The refrigeration system of claim 4 wherein said second thermal conductor is of a material nonresponsive to a magnetic field and in abutting relationship with said first thermal conductor.
Claim 7
Dependent Claim
25 words
The refrigeration system of claim 5 wherein said source of magnetic field is a permanent magnet movable between said thermal switches along said thermal conductors.
Claim 8
Dependent Claim
27 words
The refrigeration system of claim 6 wherein said first thermal conductor is of a ferrimagnetic, rear-earth, iron garnet and said thermal switches are of a superconducting material.
Claim 9
Dependent Claim
49 words
The refrigeration system of claim 7 further comprising a plurality of serial arrangements of said thermal switches and said thermal conductors arranged in refrigerating stages, each of said stages including a pair of said thermal switches, one of said first thermal conductor and one of said second thermal conductor.
Claim 10
Dependent Claim
24 words
The refrigeration system of claim 4 wherein said second thermal conductor is of a paramagnetic material which cools upon removal of a magnetic field.
Claim 11
Dependent Claim
25 words
The refrigeration system of claim 9 wherein said source of magnetic field is a permanent magnet movable between said thermal switches along said thermal conductors.
Claim 12
Dependent Claim
27 words
The refrigeration system of claim 10 wherein said first thermal conductor is of a ferrimagnetic, rare-earth, iron garnet and said thermal switches are of a superconducting material.
Claim 13
Dependent Claim
49 words
The refrigeration system of claim 11 further comprising a plurality of serial arrangements of said thermal switches and said thermal conductors arranged in refrigerating stages, each of said stages including a pair of said thermal switches, one of said first thermal conductor and one of said second thermal conductor.
Claim 14
Dependent Claim
32 words
The refrigeration system of claim 5 wherein said source of magnetic field is a plurality of solenoids adapted to be selectively energized permitting thermal flow between said switches along said thermal conductors.
Claim 15
Dependent Claim
22 words
The refrigeration system of claim 13 wherein a solenoid is provided for each of said thermal switches and said first thermal conductor.
Claim 16
Dependent Claim
27 words
The refrigeration system of claim 14 wherein said first thermal conductor is of a ferrimagnetic, rare-earth, iron garnet and said thermal switches are of a superconducting material.
Claim 17
Dependent Claim
49 words
The refrigeration system of claim 15 further comprising a plurality of serial arrangements of said thermal switches and said thermal conductors arranged in refrigerating stages, each of said stages including a pair of said thermal switches, one of said first thermal conductor and one of said second thermal conductor.
Claim 18
Dependent Claim
32 words
The refrigeration system of claim 9 wherein said source of magnetic field is an plurality of solenoids adapted to be selectively energized permitting thermal flow between said switches along said thermal conductors.
Claim 19
Dependent Claim
23 words
The refrigeration system of claim 17 wherein a solenoid is provided for each of said thermal switches and each of said thermal conductors.
Claim 20
Dependent Claim
27 words
The refrigeration system of claim 18 wherein said first thermal conductor is of a ferrimagnetic, rare-earth, iron garnet and said thermal switches are of a superconducting material.
Claim 21
Dependent Claim
49 words
The refrigeration system of claim 19 further comPrising a plurality of serial arrangements of said thermal switches and said thermal conductors arranged in refrigerating stages, each of said stages including a pair of said thermal switches, one of said first thermal conductor and one of said second thermal conductor.
References Cited (Backward Citations)
US2913881A
Cited
US3004394A
Cited
US3119236A
Cited
US3108444A
Cited
US3343009A
Cited
US3296825A
Cited
US3393526A
Cited
US3643734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |