US3774405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically driven cryogen vuilleumier refrigerator
Assignee: United States Department of the Air Force
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Filing: 1971-09-09
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Granted: 1973-11-27
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Expires: 1991-09-09
Abstract
Abstract A magnetically driven cryogenic refrigeration system using the Vuilleumier cycle having hot and cold gas displacer with incorporated regenerators, each displacer positioned in a cylinder and having a permanent magnet in its base, each cylinder having an electro magnet, powered by an alternating power source located at one end and a chamber connecting the hot and cold cylinders for allowing the gas to pass between them.
Inventors
- 👤 B Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:08
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044; F02G1/0445; F02G2250/00; F02G2250/18; F25B2309/00; F25B2309/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
The refrigeration apparatus comprising: a housing, including a first, hot cylinder, and a second, cold cylinder, said cylinders being interconnected to allow the passage of a fluid therebetween; means affixed to said first cylinder for dissipating heat away from the housing; first and second fluid displacers movably positioned in said first and second cylinders and having recessed areas so shaped as to form regenerative means between said displacers and said cylinders; magnet means positioned at one end of each of the said displacers; magnet means positioned at one end at each of said cylinders; means connected to the housing for causing a magnetic interaction between said cylinders magnet means and said displacers magnet means to cause reciprocating movement of said displacers and thereby causing movement of a fluid from one cylinder to the other cyLinder.
Claim 2
Dependent Claim
135 words
The refrigeration apparatus comprising: a housing, including a first, hot cylinder, and a second, cold cylinder, said cylinders being interconnected to allow the passage of a fluid therebetween; means affixed to said first cylinder for dissipating heat away from the housing; first and second fluid displacers movably positioned in said first and second cylinders and having recessed areas so shaped as to form regenerative means between said displacers and said cylinders; magnet means positioned at one end of each of the said displacers; magnet means positioned at one end at each of said cylinders; means connected to the housing for causing a magnetic interaction between said cylinders magnet means and said displacers magnet means to cause reciprocating movement of said displacers and thereby causing movement of a fluid from one cylinder to the other cyLinder.
Claim 3
Dependent Claim
40 words
A system according to claim 1 wherein said magnetic means for causing motion includes a permanent magnet positioned in the base of each of the first and second gas displacers and a pair of electro magnets mounted in the housing.
Claim 4
Dependent Claim
28 words
A system according to claim 2 wherein the means for controlling the motion of the gas displacers is a source of alternating current coupled to the electro magnets.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |