US4442220A
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Dielectric ceramics
Assignee: Panasonic Holdings Corp
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Filing: 1982-04-13
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Granted: 1984-04-10
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Expires: 2002-04-13
Abstract
Abstract A dielectric ceramic composition consisting essentially of a solid solution represented by the formula: xBaO-yTiO2-z{(Sm2O3)1-(v+u)(Pr2O11/3)v(Nd2O3)u} wherein 0.05</=x</=0.23, 0.57</=y</=0.825, 0.025</=Z</=0.375, x+y+z=1, 0<v</=0.95, 0</=u<0.95 and 0<(v+u)</=0.95. The dielectric ceramics exhibits high dielectric constant and low microwave loss with high temperature stability in resonant frequency and is suitable for use as dielectric resonators, electrical filters and substrate.
Inventors
- 👤 Hiromu Ouchi
- 👤 Syunichiro Kawashima
- 👤 Masamitsu Nishida
- 👤 Ichiro Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; H; H01; H01P; H01P7/00; H01P7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A dielectric ceramic composition consisting of barium oxide, titanium oxide, samarium oxide and praseodymium oxide in which the composition formula is represented by xBaO-yTiO.sub.2 -z {(Sm.sub.2 O.sub.3).sub.1-v (Pr.sub.2 O.sub.11/3).sub.v } wherein x, y, z and v in terms of mole fraction fall in the range that 0.05≦x≦0.23, 0.57≦y≦0.825, 0.025≦z≦0.375, x+y+z=1, and 0.01≦v≦0.95.
Claim 2
Dependent Claim
52 words
A dielectric ceramic composition consisting of barium oxide, titanium oxide, samarium oxide and praseodymium oxide in which the composition formula is represented by xBaO-yTiO.sub.2 -z {(Sm.sub.2 O.sub.3).sub.1-v (Pr.sub.2 O.sub.11/3).sub.v } wherein x, y, z and v in terms of mole fraction fall in the range that 0.05≦x≦0.23, 0.57≦y≦0.825, 0.025≦z≦0.375, x+y+z=1, and 0.01≦v≦0.95.
Claim 3
Dependent Claim
58 words
A dielectric ceramic composition consisting of barium oxide, titanium oxide, samarium oxide, praseodymium oxide and neodymium oxide in which the composition formula is represented by xBaO-yTiO.sub.2 -z{(Sm.sub.2 O.sub.3).sub.1-(v+u) (Pr.sub.2 O.sub.11/3).sub.v (Nd.sub.2 O.sub.3).sub.u } wherein x, y, z, v and u in terms of mole fraction fall in the range that 0.05≦x≦0.23, 0.57≦y≦0.825, 0.025≦z≦0.375, x+y+z=1, 0.01≦v≦0.65, 0.01≦u≦0.665 and 0.02≦(v+u)≦0.95.
Claim 4
Dependent Claim
58 words
A dielectric ceramic composition consisting of barium oxide, titanium oxide, samarium oxide, praseodymium oxide and neodymium oxide in which the composition formula is represented by xBaO-yTiO.sub.2 -z{(Sm.sub.2 O.sub.3).sub.1-(v+u) (Pr.sub.2 O.sub.11/3).sub.v (Nd.sub.2 O.sub.3).sub.u } wherein x, y, z, v and u in terms of mole fraction fall in the range that 0.05≦x≦0.23, 0.57≦y≦0.825, 0.025≦z≦0.375, x+y+z=1, 0.01≦v≦0.65, 0.01≦u≦0.665 and 0.02≦(v+u)≦0.95.
Claim 5
Dependent Claim
18 words
A dielectric ceramics consisting of a solid solution having the composition as defined in claim 1 or 2.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |