Patent US3708705A successfully refreshed from Google Patents.
US3708705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature apparatus
Assignee: JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) Ltd
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Filing: 1971-03-01
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Granted: 1973-01-02
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Expires: 1991-03-01
Abstract
Abstract A cryostat for cooling superconducting windings in a homopolar dynamo-electric machine, which has two spaced inner members containing the windings and cooled by cryogenic fluid and an outer member enclosing a vacuum space around the inner members, wherein the refrigeration plant for the cryogenic fluid with the exception of the compressor, is disposed in the vacuum space between the inner members to eliminate the need for thermally insulated transfer lines.
Inventors
- 👤 F Tinlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:34
CPC Classifications
H; H02; H02K; H02K55/00; H02K55/06; F; F25; F25B; F25B9/00; H01; H01F; H01F6/00; H01F6/06; H01F6/065; H02K31/00; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
In a dynamo-electric machine, a first superconducting winding forming a field winding of the machine, a second superconducting winding, a cryostat having an outer member enclosing a vacuum space, a first inner member housing said first winding, and a second inner member housing said second winding, said first and second inner members being disposed in spaced-apart relation within said vacuum space, and a refrigerator plant coupled to the said inner members of the cryostat to supply cryogenic fluid thereto, at least part of the operating cold producing portions of said refrigerator plant being disposed within the vacuum space and and located between the first and second inner members.
Claim 2
Dependent Claim
108 words
In a dynamo-electric machine, a first superconducting winding forming a field winding of the machine, a second superconducting winding, a cryostat having an outer member enclosing a vacuum space, a first inner member housing said first winding, and a second inner member housing said second winding, said first and second inner members being disposed in spaced-apart relation within said vacuum space, and a refrigerator plant coupled to the said inner members of the cryostat to supply cryogenic fluid thereto, at least part of the operating cold producing portions of said refrigerator plant being disposed within the vacuum space and and located between the first and second inner members.
Claim 3
Dependent Claim
27 words
In a machine as claimed in claim 1, a storage vessel for cryogenic fluid located in the said vacuum space within the outer member of the cryostat.
Claim 4
Dependent Claim
33 words
In a machine as claimed in claim 1, a rotor and an armature winding of non-superconducting material on said rotor, the cryostat being of annular form and encircling the periphery of the rotor.
Claim 5
Dependent Claim
49 words
In a machine as claimed in claim 3, said second winding being a coil of larger diameter then said first winding, said windings being disposed in a common plane, and said second winding acting as a degaussing winding to counteract the field of said first winding in selected regions.
Claim 6
Dependent Claim
45 words
In a machine as claimed in claim 1, a drum-type rotor, said cryostat being of generally cylindrical form and encircling said rotor, said first and second windings being annular coils and said first and second inner members being spaced apart axially of the drum-type rotor.
References Cited (Backward Citations)
US2986905A
Cited
US3292021A
Cited
US3368087A
Cited
US3469121A
Cited
US3521091A
Cited
US3517231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |