US3732438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive switch apparatus
Assignee: Individual
•
Filing: 1971-07-26
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Granted: 1973-05-08
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Expires: 1991-07-26
Abstract
Abstract Apparatus is provided whereby the conductive state of means including an element capable of exhibiting the superconductivity is controlled by the maintenance of said means in intimate thermal communication with a paramagnetic salt. The temperature of such means thereby being discretely and selectively changed by the control of the magnetic state of said paramagnetic salt.
Inventors
- 👤 R Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/92; H03K3/00; H03K3/02; H03K3/38; H10; H10N; H10N60/00; H10N60/80; H10N60/84; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/856; Y10S505/857; Y10S505/86
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A cryogenic switch comprising: means including an element capable of exhibiting superconductivity and having a first state at a first temperature and a second state at a second temperature; paramagnetic salt means in intimate thermal communication with said element means and controlling the state thereof; and means to apply a magnetic field to said paramagnetic salt means, said paramagnetic salt means, upon the energization of said magnetic field applying means, switching said element means from one of said states to the other of said states.
Claim 2
Dependent Claim
85 words
A cryogenic switch comprising: means including an element capable of exhibiting superconductivity and having a first state at a first temperature and a second state at a second temperature; paramagnetic salt means in intimate thermal communication with said element means and controlling the state thereof; and means to apply a magnetic field to said paramagnetic salt means, said paramagnetic salt means, upon the energization of said magnetic field applying means, switching said element means from one of said states to the other of said states.
Claim 3
Dependent Claim
18 words
The superconductive switch of claim 1 wherein said paramagnetic salt is powdered and physically surrounds said element means.
Claim 4
Dependent Claim
18 words
The superconductive switch of claim 1 wherein said paramagnetic salt constitutes a crystal grown on said element means.
Claim 5
Dependent Claim
67 words
The apparatus of claim 1 wherein the means to apply a magnetic field to said paramagnetic salt means includes a member capable of carrying current spatially overlapping a portion of said means including an element capable of exhibiting superconductivity, said paramagnetic salt means being interposed between said member capable of carrying current and said means including an element capable of exhibiting superconductivity at the overlapping portions thereof.
Claim 6
Dependent Claim
45 words
The superconductive switch of claim 1 wherein said first state is essentially a zero resistance state and said second state is a relatively high resistance state, said first temperature being below a clearly defined range and said second temperature being above said clearly defined range.
Claim 7
Dependent Claim
50 words
The superconductive switch of claim 5 additionally comprising means to initially maintain the ambient environmental temperature of said element means at essentially said second temperature, whereby said means to apply a magnetic field to said paramagnetic salt means is normally energized and said switch is normally in the off condition.
Claim 8
Dependent Claim
50 words
The superconductive switch of claim 5 additionally comprising means to initially maintain the ambient environmental temperature of said element means at essentially said first temperature, whereby said means to apply a magnetic field to said paramagnetic salt means is normally de-energized and said switch is normally in the on condition.
Claim 9
Dependent Claim
19 words
The superconductive switch of claim 7 wherein said paramagnetic salt means constitutes a crystal grown about said element means.
References Cited (Backward Citations)
US2832897A
Cited
US2946030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |