US3969252A
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Dielectric ceramic compositions of BaTiO3 -BaZrO3 -CaTiO3 system
Assignee: NEC Corp
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Filing: 1974-09-16
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Granted: 1976-07-13
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Expires: 1994-09-16
Abstract
Abstract A dielectric material is provided consisting essentially of a composition based on the general formula: (BaTiO.sub.3).sub.x.(BaZrO.sub.3).sub.y.(CaTiO.sub.3).sub.z, Wherein x=y=z = 1.0 and in which x, y and z have the following ranges: 0.4 ≦ x ≦ 0.89, 0.1 ≦ y ≦ 0.3 and 0.01 ≦ z ≦ 0.3, respectively, said composition also containing between 0.001 wt% and 0.5 wt% SiO 2 and between 0.01 mol% and 3 mol% TiO 2 .
Inventors
- 👤 Kazuaki Utsumi
- 👤 Tomeji Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/025; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A method of improving the time stability of permittivity properties of a dielectric ceramic consisting essentially of a composition determined by the general formula: (BaTiO 3 ) x .(BaZrO 3 ) y .(CaTiO 3 ) z , wherein x+y+z = 1.0 and x, y and z have the following ranges, respectively: 0.4≦ x ≦0.89, 0.1≦ y ≦0.3 and 0.01≦ z ≦0.3 which comprises, adding to said composition between 0.001 wt.% to 0.5 wt.% SiO 2 and between 0.01 mol% to 3 mol% TiO 2 .
Claim 2
Independent Claim
85 words
A method of improving the time stability of permittivity properties of a dielectric ceramic consisting essentially of a composition determined by the general formula: (BaTiO 3 ) x .(BaZrO 3 ) y .(CaTiO 3 ) z , wherein x+y+z = 1.0 and x, y and z have the following ranges, respectively: 0.4≦ x ≦0.89, 0.1≦ y ≦0.3 and 0.01≦ z ≦0.3 which comprises, adding to said composition between 0.001 wt.% to 0.5 wt.% SiO 2 and between 0.01 mol% to 3 mol% TiO 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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |