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US4670409A
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Dielectric ceramic material
Assignee: Kyocera Corp
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Filing: 1985-11-26
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Granted: 1987-06-02
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Expires: 2005-11-26
Abstract
Abstract Disclosed is a dielectric ceramic material comprising lanthanum magnesiumtitanate having a perovskite structure. The lanthanum magnesiumtitanate is preferably used in the form of a composition of the lanthanum magnesiumtitanate and calcium titanate as the dielectric ceramic material. The dielectric ceramic material has a small dielectric loss and a large dielectric constant, and the temperature coefficient of the resonance frequency can be controlled to a small value within a certain range. This dielectric material is valuable as a microwave resonator.
Inventors
- 👤 Takashi Okawa
- 👤 Nobuo Yokoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
A dielectric ceramic material consisting essentially of lanthanum magnesiumtitanate represented by the following formula: La(Mg.sub.1/2 Ti.sub.1/2)O.sub.3 wherein said dielectric ceramic material has a perovskite structure.
Claim 2
Dependent Claim
25 words
A dielectric ceramic material consisting essentially of lanthanum magnesiumtitanate represented by the following formula: La(Mg.sub.1/2 Ti.sub.1/2)O.sub.3 wherein said dielectric ceramic material has a perovskite structure.
Claim 3
Dependent Claim
42 words
A dielectric ceramic material consisting essentially of a solid solution of lanthanum magnesiumtitanate and calcium titanate represented by the following formula: (1-x)La(Mg.sub.1/2 Ti.sub.1/2)O.sub.3.xCaTiO.sub.3 wherein x is a positive number of up to 0.7 and said dielectric ceramic material has a perovskite structure.
Claim 4
Dependent Claim
42 words
A dielectric ceramic material consisting essentially of a solid solution of lanthanum magnesiumtitanate and calcium titanate represented by the following formula: (1-x)La(Mg.sub.1/2 Ti.sub.1/2)O.sub.3.xCaTiO.sub.3 wherein x is a positive number of up to 0.7 and said dielectric ceramic material has a perovskite structure.
Claim 5
Dependent Claim
21 words
A dielectric ceramic material as set forth in claim 2, wherein x is a positive number of from 0.3 to 0.65.
Claim 6
Dependent Claim
21 words
A dielectric ceramic material as set forth in claim 2, wherein x is a positive number of from 0.47 to 0.59.
Claim 7
Dependent Claim
15 words
A microwave resonator composed of a dielectric ceramic material as set forth in claim 1.
Claim 8
Dependent Claim
15 words
A microwave resonator composed of a dielectric ceramic material as set forth in claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |