US5376603A
Expired / Lapsed
US
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Dielectric ceramic for microwaves
Assignee: Kyocera Corp
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Filing: 1994-04-28
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Granted: 1994-12-27
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Expires: 2014-04-28
Abstract
Abstract In a dielectric ceramic composed of a La2O3-CaO-TiO2-MgO type or a BaO-Nd2O3-TiO2 type, the oxygen vacancy concentration of the ceramic is controlled below 7x1018/cm3 by, for example, annealing the mixture after firing, or heat-treating the mixture after firing. The Q value of the dielectric ceramic can be markedly increased. In addition, ceramics having stable properties can be produced. Thus, the dielectric ceramics can fully cope with high frequencies and large electrification.
Inventors
- 👤 Seiichiro Hirahara
- 👤 Nobuyoshi Fujikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; C04B35/4688; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A dielectric ceramic composition for microwaves comprising metal complex oxides having an oxygen vacancy concentration of not more than 7×10 18 /cm 3 wherein the metal complex oxides comprise Ti or Ti ions as a metal component.
Claim 2
Dependent Claim
37 words
A dielectric ceramic composition for microwaves comprising metal complex oxides having an oxygen vacancy concentration of not more than 7×10 18 /cm 3 wherein the metal complex oxides comprise Ti or Ti ions as a metal component.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the metal complex oxides comprise La, Ti, Mg and Ca as metal components thereof.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein the metal complex oxides comprise Ba, Ti and a rare earth element as metal components thereof.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein the atomic ratio of Ba:Ti:rare earth element is in the range of 10-20:50-80:10-40.
Claim 6
Dependent Claim
25 words
The composition of claim 1 wherein the metal complex oxides comprise titanium, a rare earth element, and a Group IIa element of the periodic table.
Claim 7
Dependent Claim
48 words
The composition of claim 5 wherein the metal complex oxides comprise at least 15 to 80 atomic ratio % of titanium, 5 to 75 atomic ratio % of a rare earth element, and 10 to 80 atomic ratio % of a Group IIa element of the periodic table.
Claim 8
Dependent Claim
47 words
A dielectric ceramic composition for microwaves comprising metal complex oxides having an oxygen vacancy concentration of not more than 7×10 18 /cm 3 wherein the metal complex oxides comprises La, Ti, Mg and Ca, and wherein the atomic ratio of La:Ti:Mg:Ca is in the range of 15-60:15-45:7.5-45:0-35.
Claim 9
Dependent Claim
47 words
A dielectric ceramic composition for microwaves comprising metal complex oxides having an oxygen vacancy concentration of not more than 7×10 18 /cm 3 wherein the metal complex oxides comprises La, Ti, Mg and Ca, and wherein the atomic ratio of La:Ti:Mg:Ca is in the range of 15-60:15-45:7.5-45:0-35.
Claim 10
Dependent Claim
33 words
The composition of claim 1 wherein the complex metal oxides further comprise a metal component selected from Bi and Pb, the metal component being 5% to 30% by weight based on the oxides.
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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) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |