US5328893A
Expired / Lapsed
US
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Superconducting devices having a variable conductivity device for introducing energy loss
Assignee: Clearday Inc
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Filing: 1991-06-24
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Granted: 1994-07-12
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Expires: 2011-06-24
Abstract
Abstract Active superconductive devices are formed having a variable conductive element in electromagnetic contact with a superconductor. In one embodiment, a variable ohmic conductive device, such as a photoconductor, is placed adjacent a superconductor. By varying the optical radiation on the photoconductor, the electromagnetic environment adjacent the superconductor is changed, resulting in changed electrical properties. The superconductor may be patterned as a reject filter, with a photoconductor forming a microwave switch. Alternatively, a delay line plus variable ohmic element forms a phase shifter.
Inventors
- 👤 Jonathan Z. Sun
- 👤 Robert B. Hammond
- 👤 Douglas J. Scalapino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:42
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/08; H01P7/088; H01P1/00; H01P1/20; H01P1/201; H01P1/203; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/825; Y10S505/866
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
An active superconducting device comprising: a passive superconductive device for receiving a current from a current source which generates an electromagnetic field adjacent the passive superconductive device, and a variable conductivity device said variable conductivity device being separate from the passive superconductive device, the variable conductivity device being located within the electromagnetic field of the passive superconductive device, said variable conductivity device introducing a variable energy loss to the electromagnetic field from the superconductive device.
Claim 2
Dependent Claim
75 words
An active superconducting device comprising: a passive superconductive device for receiving a current from a current source which generates an electromagnetic field adjacent the passive superconductive device, and a variable conductivity device said variable conductivity device being separate from the passive superconductive device, the variable conductivity device being located within the electromagnetic field of the passive superconductive device, said variable conductivity device introducing a variable energy loss to the electromagnetic field from the superconductive device.
Claim 3
Dependent Claim
16 words
The active superconducting device of claim 1 wherein the variable conductivity device is an opto-electronic device.
Claim 4
Dependent Claim
14 words
The active superconducting device of claim 2 wherein the opto-electronic device is a photoconductor.
Claim 5
Dependent Claim
16 words
The active superconducting device of claim 3 wherein the photoconductor is comprised of semi-insulating gallium arsenide.
Claim 6
Dependent Claim
15 words
The active superconductive device of claim 1 wherein the passive superconductive device is a filter.
Claim 7
Dependent Claim
60 words
A superconductive filter comprising: a superconductive resonator disposed on a substrate, an input and an output electromagnetically coupled to said superconductive resonator, the input receiving a signal energy to be filtered and the output providing a filtered signal energy and a photoconductor disposed adjacent the superconductive resonator whereby when said photoconductor is illuminated signal energy is lost from the resonator.
Claim 8
Dependent Claim
60 words
A superconductive filter comprising: a superconductive resonator disposed on a substrate, an input and an output electromagnetically coupled to said superconductive resonator, the input receiving a signal energy to be filtered and the output providing a filtered signal energy and a photoconductor disposed adjacent the superconductive resonator whereby when said photoconductor is illuminated signal energy is lost from the resonator.
Claim 9
Dependent Claim
17 words
The filter of claim 6 further including a second resonator coupled to said input and said output.
Claim 10
Dependent Claim
19 words
The superconductive filter of claim 6 further including an intermediate support material disposed between the resonator and the photoconductor.
Claim 11
Dependent Claim
13 words
The superconductive filter of claim 8 wherein the support material is a polyimide.
Claim 12
Dependent Claim
14 words
The superconductive filter of claim 6 wherein the filter is a band reject filter.
Claim 13
Dependent Claim
12 words
The superconductive filter of claim 6 wherein the photoconductor is gallium arsenide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |