US4135127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current transformer
Assignee: National Aeronautics and Space Administration
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Filing: 1977-03-29
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Granted: 1979-01-16
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Expires: 1997-03-29
Abstract
Abstract A direct current transformer in which the primary consists of an elongated strip of superconductive material, across the ends of which is applied a direct current potential. Parallel and closely spaced to the primary is positioned a transformer secondary consisting of a thin strip of magnetoresistive material.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 Shyam M. Khanna
- 👤 Eugene W. Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:17
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2804; H01F36/00; H01F38/00; H01F38/20; H01F38/40; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S336/00; Y10S336/01; Y10S505/00; Y10S505/825; Y10S505/869; Y10S505/87
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
188 words
A direct current transformer comprising: a primary electrical conductor having a pair of opposite ends comprising transformer input terminals; a source of D.C. signal, I P , connected across said terminals, whereby a direct magnetic field is provided; the material of said primary electrical conductor and level of said D.C. signal I P being such that said primary electrical conductor is superconductive in the presence of said signal I P , and that said signal I P rises at least to the critical level for said superconductive material, whereby moving vortices are created in said primary electrical conductor; a secondary electrical conductor of a magneto-resistive material, said secondary conductor being positioned closely adjacent to, but electrically insulated from, said first conductor, and having a pair of unbiased end terminals; and environmental means for applying a low temperature to said primary and secondary electrical conductors, said temperature being no higher than the superconducting transition of said primary electrical conductor; whereby D.C. potential V S appears across said terminals of said secondary conductor responsive to the application of said signal I P across said terminals of said primary electrical conductor.
Claim 2
Dependent Claim
188 words
A direct current transformer comprising: a primary electrical conductor having a pair of opposite ends comprising transformer input terminals; a source of D.C. signal, I P , connected across said terminals, whereby a direct magnetic field is provided; the material of said primary electrical conductor and level of said D.C. signal I P being such that said primary electrical conductor is superconductive in the presence of said signal I P , and that said signal I P rises at least to the critical level for said superconductive material, whereby moving vortices are created in said primary electrical conductor; a secondary electrical conductor of a magneto-resistive material, said secondary conductor being positioned closely adjacent to, but electrically insulated from, said first conductor, and having a pair of unbiased end terminals; and environmental means for applying a low temperature to said primary and secondary electrical conductors, said temperature being no higher than the superconducting transition of said primary electrical conductor; whereby D.C. potential V S appears across said terminals of said secondary conductor responsive to the application of said signal I P across said terminals of said primary electrical conductor.
Claim 3
Dependent Claim
58 words
A direct current transformer as set forth in claim 1 further comprising bias means for applying a second magnetic field to said primary and secondary conductors, whereby together the applied magnetic fields produce a magnetic field which penetrates said primary and secondary conductors, and said magnetic fields do not exceed a value which would render said primary non-superconductive.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |