US4014707A
Expired / Lapsed
US
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Ceramic dielectric composition
Assignee: TDK Corp
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Filing: 1975-07-08
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Granted: 1977-03-29
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Expires: 1995-07-08
Abstract
Abstract A dielectric ceramic composition comprises as principle constituents, 86 - 99.6 mole % of barium titanate, 0.2 - 10 mole % of niobium pentaoxide and 0.2 - 4 mole % of cerium oxide.
Inventors
- 👤 Hitoshi Tanaka
- 👤 Hitoshi Masumura
- 👤 Shinobu Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:30
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: 11
Claim 1
Independent Claim
30 words
A dielectric ceramic composition which comprises as principle constituents, 86-99.6 mole % of barium titanate, 0.2 - 10 mole% of niobium pentaoxide and 0.2 - 4 mole% of cerium oxide.
Claim 2
Dependent Claim
30 words
A dielectric ceramic composition which comprises as principle constituents, 86-99.6 mole % of barium titanate, 0.2 - 10 mole% of niobium pentaoxide and 0.2 - 4 mole% of cerium oxide.
Claim 3
Dependent Claim
34 words
The dielectric ceramic composition of claim 1, which comprises as principle constituents, 92 - 99.6 mole% of barium titanate, 0.2 - 6.0 mole% of niobium pentaoxide and 0.2 - 2.0 mole% of cerium oxide.
Claim 4
Dependent Claim
36 words
The dielectric ceramic composition of claim 1, which further contains at least one of calcium titanate or magnesium titanate in an amount of less than 10 wt% relative to the total amount of the principle constituents.
Claim 5
Dependent Claim
36 words
The dielectric ceramic composition of claim 3, wherein at least one of calcium titanate or magnesium titanate is present in an amount of 0.5 - 5.0 wt% relative to the total amount of the principle constituents.
Claim 6
Dependent Claim
46 words
The dielectric ceramic composition of claim 1, which further comprises at least one of the oxides of Mn, Cr, Fe, Ni or Co, clay or a rare earth element in an amount of 0.01 - 0.5 wt% relative to the total amount of the principle constituents.
Claim 7
Dependent Claim
46 words
The dielectric ceramic composition of claim 5, wherein at least one of the oxides of Mn, Cr, Fe, Ni and Co, clay or a rare earth element is present in an amount of 0.05 - 0.3 wt% relative to the total amount of the principle constitutents.
Claim 8
Dependent Claim
72 words
The dielectric ceramic composition of claim 1, which further comprises at least one of calcium titanate or magnesium titanate in an amount of less than 10 wt% relative to the total amount of the principle constituents and at least one of the oxides of Mn, Cr, Fe, Ni and Co, clay or rare earth element in an amount of 0.01 - 0.5 wt% relative to the total amount of the principle constituents.
Claim 9
Dependent Claim
20 words
The dielectric ceramic composition of claim 5, wherein the rare earth element is present in the form of an oxide.
Claim 10
Dependent Claim
21 words
The dielectric ceramic composition of claim 1, comprising 98 mole% barium titanate, 1 mole% niobium pentaoxide and 1 mole% cerium oxide.
Claim 11
Dependent Claim
43 words
The dielectric ceramic composition of claim 7, comprising 0.05 wt% of MnO and 5 wt% of calcium titanate relative to the total amount of principle constituents in the composition of 98 mole% barium titanate, 0.8 mole% cerium oxide, and 1.2 mole% niobium pentaoxide.
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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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |