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US4749669A
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Dielectric ceramic composition
Assignee: Narumi China Corp
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Filing: 1986-05-07
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Granted: 1988-06-07
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Expires: 2006-05-07
Abstract
Abstract A dielectric ceramic composition comprising a ternary system composition represented by the formula, aBaO.bTiO 2 .cWO 3 (wherein a, b and c are percent molar fractions totaling 100, i.e., a+b+c=100; 17≦a≦21.5; 75≦b≦83 and 0.1≦c≦5) and characterized by an advantageous properties, particularly, high dielectric constant, large Q and small τf. In the compositions, TiO 2 may be partially replaced by ZrO 2 and, optionally, MnO may be also included up to 3 mole percent based on the total molar amount of the foregoing ingredients. The dielectric ceramic compositions are especially, but not exclusively, useful in microwave applications because of the foregoing advantages.
Inventors
- 👤 Susamu Nishigaki
- 👤 Shinsuke Yano
- 👤 Hiroshi Kato
- 👤 Tohru Fuwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A dielectric ceramic composition which comprises a ternary system composition represented by the formula, aBaO.bTiO 2 .cWO 3 wherein a, b and c are percent molar fractions and a+b+c=100; 17≦a≦21.5; 75≦b≦83; and 0.1≦c≦5.
Claim 2
Dependent Claim
33 words
A dielectric ceramic composition which comprises a ternary system composition represented by the formula, aBaO.bTiO 2 .cWO 3 wherein a, b and c are percent molar fractions and a+b+c=100; 17≦a≦21.5; 75≦b≦83; and 0.1≦c≦5.
Claim 3
Dependent Claim
31 words
A dielectric ceramic composition which comprises a ternary system composition represented by the formula, ##EQU3## wherein a, b and c are percent molar fractions and a+b+c=100; 17≦a≦21.5; 75≦b≦83; 0.1≦c≦5 and 0≦n<10.
Claim 4
Dependent Claim
31 words
A dielectric ceramic composition which comprises a ternary system composition represented by the formula, ##EQU3## wherein a, b and c are percent molar fractions and a+b+c=100; 17≦a≦21.5; 75≦b≦83; 0.1≦c≦5 and 0≦n<10.
Claim 5
Dependent Claim
28 words
A dielectric ceramic composition as claimed in claim 1, containing up to 3 mole percent of MnO, based on the total molar amount of a, b and c.
Claim 6
Dependent Claim
28 words
A dielectric ceramic composition as claimed in claim 2, containing up to 3 mole percent of MnO, based on the total molar amount of a, b and c.
References Cited (Backward Citations)
GB907719A
Cited
US3195030A
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JPS50132493A
Cited
DE2941304A1
Cited
JPS55100606A
Cited
JPS6042802A
Cited
US4621066A
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |