US4248727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric ceramics
Assignee: Panasonic Holdings Corp
•
Filing: 1979-12-04
•
Granted: 1981-02-03
•
Expires: 1999-12-04
Abstract
Abstract A dielectric ceramic having a composition expressible by (1-w) (xBaO·yNa 2 O·zNb 2 O 5 )+wMeO·ZrO 2 wherein Me denotes Ca or Sr, 0.593≦x≦0.762, 0.04≦y≦0.13, 0.174≦z≦0.32, x+y-z=1, and 0<w≦0.95. It exhibits large dielectric constant and low microwave loss with high temperature-stability for resonant frequency and is suitable for use as dielectric resonators, electrical filters, substrates, etc.
Inventors
- 👤 Syunichiro Kawashima
- 👤 Masamitsu Nishida
- 👤 Ichiro Ueda
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:49
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A dielectric ceramic consisting essentially of a solid solution represented by the formula (1-w) (xBaO.yNa.sub.2 O.zNb.sub.2 O.sub.5)+wMeO.ZrO.sub.2 wherein Me denotes Ca or Sr, 0.593≦x≦0.762, 0.04≦y≦0.13, 0.174≦z≦0.32, x+y+z=1, and 0<w≦0.95 and having a dielectric constant from 28 to 40, Q value of 2700 to 4500 and a temperature coefficient of resonant frequency of +63 to -43 ppm/°C.
Claim 2
Dependent Claim
56 words
A dielectric ceramic consisting essentially of a solid solution represented by the formula (1-w) (xBaO.yNa.sub.2 O.zNb.sub.2 O.sub.5)+wMeO.ZrO.sub.2 wherein Me denotes Ca or Sr, 0.593≦x≦0.762, 0.04≦y≦0.13, 0.174≦z≦0.32, x+y+z=1, and 0<w≦0.95 and having a dielectric constant from 28 to 40, Q value of 2700 to 4500 and a temperature coefficient of resonant frequency of +63 to -43 ppm/°C.
References Cited (Backward Citations)
US3708315A
Cited
US3696314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |