US4599677A
Expired / Lapsed
US
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Capacitive energy storage device for use at cryogenic temperatures
Assignee: CERAMPHYSICS Inc A CORP OF OHIO
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Filing: 1984-06-01
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Granted: 1986-07-08
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Expires: 2004-06-01
Abstract
Abstract A capacitive energy storage device is provided utilizing a ferroelectric pyrochlore ceramic material as the dielectric. The preferred ceramic material has the formula: (Cd.sub.1-x Pb.sub.x).sub.2 (Nb.sub.1-y Ta.sub.y).sub.2 O.sub.7, where x and y are numbers in the range of from 0 to 1. Other ceramic materials used in the invention are the non-pyrochlore ceramic material (Sr 1-a Ba a )TiO 3 or the non-pyrochlore ceramic material (Pb 1-b Ni b ) 3 MgNb 2 O 9 . These ceramic materials exhibit large dielectric constants at temperatures in the range of 50°-90° K.
Inventors
- 👤 William N. Lawless
- 👤 C. Frederick Clark, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:28
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A capacitive energy storage device for use at cryogenic temperatures comprising first and second electrodes having a layer of dielectric material therebetween, said dielectric material consisting essentially of a pyrochlore ferroelectric ceramic having the formula: (Cd.sub.1-x Pb.sub.x).sub.2 (Nb.sub.1-y Ta.sub.y).sub.2 O.sub.7 where x and y are numbers in the range of from 0 to 1.
Claim 2
Dependent Claim
54 words
A capacitive energy storage device for use at cryogenic temperatures comprising first and second electrodes having a layer of dielectric material therebetween, said dielectric material consisting essentially of a pyrochlore ferroelectric ceramic having the formula: (Cd.sub.1-x Pb.sub.x).sub.2 (Nb.sub.1-y Ta.sub.y).sub.2 O.sub.7 where x and y are numbers in the range of from 0 to 1.
Claim 3
Dependent Claim
16 words
The capacitive energy storage device of claim 1 in which x is between 0.15 and 0.30.
Claim 4
Dependent Claim
16 words
The capacitive energy storage device of claim 1 in which y is between 0.3 and 0.7.
Claim 5
Dependent Claim
16 words
The capacitive energy storage device of claim 1 in which x is between 0.17 and 0.20.
Claim 6
Dependent Claim
13 words
The capacitive energy storage device of claim 1 in which y is 0.50.
Claim 7
Dependent Claim
29 words
The capacitive energy storage device of claim 1 in which the transition temperature, T c , of said dielectric material is below the predetermined operating temperature of said device.
Claim 8
Dependent Claim
34 words
The capacitive energy storage device of claim 1 in which the maximum value for dielectric constant, ε max , of said dielectric material occurs in the temperature range of from 50 to 90 K.
Claim 9
Dependent Claim
64 words
A capacitive energy storage device for use at cryogenic temperatures comprising first and second electrodes having a layer of dielectric material consisting of a non-pyrochlore ceramic material having the formula: (Sr 1-a Ba a )TiO 3 , where a ranges 0 to 0.5 or the non-pyrochlore ceramic material (Pb 1-b Ni b ) 3 MgNb 2 O 9 where b ranges 0 to 1.
Claim 10
Dependent Claim
64 words
A capacitive energy storage device for use at cryogenic temperatures comprising first and second electrodes having a layer of dielectric material consisting of a non-pyrochlore ceramic material having the formula: (Sr 1-a Ba a )TiO 3 , where a ranges 0 to 0.5 or the non-pyrochlore ceramic material (Pb 1-b Ni b ) 3 MgNb 2 O 9 where b ranges 0 to 1.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |