US4242213A
Expired / Lapsed
US
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Dielectric ceramic compositions based on magnesium, calcium and rare earth metal titanates
Assignee: Murata Manufacturing Co Ltd
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Filing: 1979-04-19
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Granted: 1980-12-30
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Expires: 1999-04-19
Abstract
Abstract A dielectric ceramic composition for microwave applications consists essentially of a sintered mixture represented by the general formula: (1-x)MgTiO3-x(Ca1-yMey)TiO3 wherein Me is at least one rare earth element selected from the group of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and wherein x and y are molar fractions of respective components and take values within the following respective ranges: 0.03</=x</=0.15, 0.001</=y</=0.06. The composition is a fine-grained, dence ceramic and enables to produce microwave devices with high permittivity, high quality factor and small temperature coefficient of resonance frequency.
Inventors
- 👤 Hiroshi Tamura
- 👤 Masayoshi Katsube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A dielectric ceramic composition for microwave applications consisting essentially of a mixture represented by the general formula: (1-x)MgTiO.sub.3 -x(Ca.sub.1-y Me.sub.y)TiO.sub.3 wherein Me is at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and wherein x and y are molar fractions of respective components with values within the following respective ranges: 0.03≦x≦0.15, 0.001≦y≦0.06.
Claim 2
Dependent Claim
72 words
A dielectric ceramic composition for microwave applications consisting essentially of a mixture represented by the general formula: (1-x)MgTiO.sub.3 -x(Ca.sub.1-y Me.sub.y)TiO.sub.3 wherein Me is at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and wherein x and y are molar fractions of respective components with values within the following respective ranges: 0.03≦x≦0.15, 0.001≦y≦0.06.
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |