US4872086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric RF devices suited for use with superconductors
Assignee: Motorola Solutions Inc
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Filing: 1988-10-20
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Granted: 1989-10-03
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Expires: 2008-10-20
Abstract
Abstract Ceramic dielectric substrates, calcium titanate, bismuth titanate and strontium titanate, used with superconductor, Ytrium Barium Copper Oxide, or YBC, as an electrode, produce a superconducting electrical device, useable as a filter or capacitor. The electrical device formed by using one of the dielectrics taught herein in combination with YBC, is mechanically stable in comparison to prior art ceramic dielectrics that used YBC for an electrode material, in that the YBC is substantially free of microcracks and remains bonded to the substrates.
Inventors
- 👤 Rong F. Huang
- 👤 Wei-Yean Howng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/005; H01G4/008; H01G4/0085; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47; C04B35/472; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3231; C04B2235/3251; C04B2235/3284; C04B2235/3296
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
An electrical device comprising: a ceramic dielectric of a first suitable titanate material having a dielectric constant K of at least 100 at radio frequencies over 400 megahertz having thermal expansion coefficient between 10 and 14 parts per million per degree centigrade and having at least first and second sides; and at least one superconducting electrode disposed onto both of said first and second sides of said dielectric said electrode having a thermal expansion coefficient of approximately 14 to 15 parts per million per degrees centigrade and superconducting at at least one temperature above the temperature of liquid nitrogen, said electrode being substantially free of micro-cracks after repetitive temperature cycling between at least the temperature of liquid nitrogen and room temperature.
Claim 2
Dependent Claim
121 words
An electrical device comprising: a ceramic dielectric of a first suitable titanate material having a dielectric constant K of at least 100 at radio frequencies over 400 megahertz having thermal expansion coefficient between 10 and 14 parts per million per degree centigrade and having at least first and second sides; and at least one superconducting electrode disposed onto both of said first and second sides of said dielectric said electrode having a thermal expansion coefficient of approximately 14 to 15 parts per million per degrees centigrade and superconducting at at least one temperature above the temperature of liquid nitrogen, said electrode being substantially free of micro-cracks after repetitive temperature cycling between at least the temperature of liquid nitrogen and room temperature.
Claim 3
Dependent Claim
22 words
The device of claim 1 where said electrode is made of Ytrium Barium Copper Oxide, YBa 2 Cu 3 O x .
Claim 4
Dependent Claim
33 words
The device of claim 1 where said ceramic dielectric is made of a material selected from the group consisting of CaTiO 3 , Bi 4 Ti 3 O 12 and SrTiO 3 .
Claim 5
Dependent Claim
33 words
The device of claim 1 where said ceramic dielectric is made of a material selected from the group consisting of CaTiO 3 , Bi 4 Ti 3 O 12 and SrTiO 3 .
Claim 6
Dependent Claim
11 words
The device of claim 1 where said device is a capacitor.
Claim 7
Dependent Claim
11 words
The device of claim 1 where said device is a filter.
Claim 8
Dependent Claim
13 words
The device of claim 1 where said ceramic dielectric is CaTiO 3 .
Claim 9
Dependent Claim
17 words
The device of claim 1 where said ceramic dielectric is Bi 4 Ti 3 O 12 .
Claim 10
Dependent Claim
13 words
The device of claim 1 where said ceramic dielectric is SrTiO 3 .
Claim 11
Dependent Claim
118 words
An electrical device comprising: a ceramic dielectric of a first suitable titanate material having a dielectric constant K of at least 100 at radio frequencies over 400 Megahertz and having at least first and second sides; and at least one superconducting electrode disposed onto both of said first and said second sides of said dielectric said electrodes superconducting electric current at at least one temperature above the temperature of liquid nitrogen, said electrode being substantially free of micro-cracks after temperature cycling between the temperature of liquid nitrogen and room temperature, said electrodes and said dielectric having thermal expansion coefficients substantially similar such that said electrodes remain firmly bonded to said ceramic dielectric, said dielectric not poisoning said electrodes.
Claim 12
Dependent Claim
118 words
An electrical device comprising: a ceramic dielectric of a first suitable titanate material having a dielectric constant K of at least 100 at radio frequencies over 400 Megahertz and having at least first and second sides; and at least one superconducting electrode disposed onto both of said first and said second sides of said dielectric said electrodes superconducting electric current at at least one temperature above the temperature of liquid nitrogen, said electrode being substantially free of micro-cracks after temperature cycling between the temperature of liquid nitrogen and room temperature, said electrodes and said dielectric having thermal expansion coefficients substantially similar such that said electrodes remain firmly bonded to said ceramic dielectric, said dielectric not poisoning said electrodes.
Claim 13
Dependent Claim
36 words
The device of claim 10 where said electrode has a thermal expansion coefficient of approximately 14-15 parts per million per degree centigrade, said electrode superconducting at at least one temperature above the temperature of liquid nitrogen.
Claim 14
Dependent Claim
22 words
The device of claim 10 where said electrode is made of Ytrium Barium Copper Oxide, YBa 2 Cu 3 O x .
Claim 15
Dependent Claim
33 words
The device of claim 12 where said ceramic dielectric is made of a material selected from the group consisting of CaTiO 3 , Bi 4 Ti 3 O 12 and SrTiO 3 .
Claim 16
Dependent Claim
33 words
The device of claim 10 where said ceramic dielectric is made of a material selected from the group consisting of CaTiO 3 , Bi 4 Ti 3 O 12 and SrTiO 3 .
Claim 17
Dependent Claim
11 words
The device of claim 10 where said device is a capacitor.
Claim 18
Dependent Claim
11 words
The device of claim 10 where said device is a filter.
Claim 19
Dependent Claim
13 words
The device of claim 10 where said ceramic dielectric is CaTiO 3 ,
Claim 20
Dependent Claim
17 words
The device of claim 10 where said ceramic dielectric is Bi 4 Ti 3 O 12 .
Claim 21
Dependent Claim
13 words
The device of claim 10 where said ceramic dielectric is SrTiO 3 .
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |