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US4109456A
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US
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Ceramic capacitor
Assignee: Suwa Seikosha KK
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Filing: 1975-07-07
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Granted: 1978-08-29
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Expires: 1995-07-07
Abstract
Abstract A ceramic capacitor operatively connected to a piezoelectric oscillator for compensating for the temperature dependence of the oscillator frequency is provided for thereby optimizing the accuracy of an electronic timepiece.
Inventors
- 👤 Kuniharu Yamada
- 👤 Katsuhiro Teraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; H; H03; H03L; H03L1/00; H03L1/02; H03L1/028
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
196 words
An improved temperature compensating capacitor comprising a ceramic including at least 90 mol % of an admixture of BaTiO 3 and BaSnO 3 , the content of BaTiO 3 lying between 80.7 and 84.0 mol % and the content of BaSnO 3 lying between 10.0 and 14.0 mol %, and the remainder of the ceramic composition containing at least one oxide selected from a first group consisting of SrTiO 3 , CaSnO 3 , CaTiO 3 and MgTiO 3 in an amount from 1.7 to 7.0 mol % and at least one oxide selected from a second group consisting of SiO 2 , Fe 2 O 3 , MnO 2 , CoO, V 2 O 5 and CeO 2 in an amount from 0.3 to 0.5 mol %, said capacitor having a Curie point lying within the ambient temperature range and having a change-rate of at least 30% between its Curie point and its Curie point ± 20° C, wherein the change-rate of said capacitor is defined as ##EQU2## C 0 being the capacity of said capacitor at its Curie point, and C 1 being the capacity of said capacitor at its Curie ± 20° C.
Claim 2
Dependent Claim
196 words
An improved temperature compensating capacitor comprising a ceramic including at least 90 mol % of an admixture of BaTiO 3 and BaSnO 3 , the content of BaTiO 3 lying between 80.7 and 84.0 mol % and the content of BaSnO 3 lying between 10.0 and 14.0 mol %, and the remainder of the ceramic composition containing at least one oxide selected from a first group consisting of SrTiO 3 , CaSnO 3 , CaTiO 3 and MgTiO 3 in an amount from 1.7 to 7.0 mol % and at least one oxide selected from a second group consisting of SiO 2 , Fe 2 O 3 , MnO 2 , CoO, V 2 O 5 and CeO 2 in an amount from 0.3 to 0.5 mol %, said capacitor having a Curie point lying within the ambient temperature range and having a change-rate of at least 30% between its Curie point and its Curie point ± 20° C, wherein the change-rate of said capacitor is defined as ##EQU2## C 0 being the capacity of said capacitor at its Curie point, and C 1 being the capacity of said capacitor at its Curie ± 20° C.
Claim 3
Dependent Claim
36 words
The capacitor as claimed in claim 1, including in operative combination therewith, a piezoelectric oscillator subject to time variance as a function of temperature, and circuit means providing operative connection between said capacitor and said oscillator.
Claim 4
Dependent Claim
36 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 80.7 mol % BaTiO 3 , 12.0 mol % BaSnO 3 , 7.0 mol % CaTiO 3 , and 0.3 mol % MnO 2 .
Claim 5
Dependent Claim
36 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 80.7 mol % BaTiO 3 , 12.0 mol % BaSnO 3 , 7.0 mol % CaTiO 3 , and 0.3 mol % MnO 2 .
Claim 6
Dependent Claim
52 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 83.0 mol % BaTiO 3 , 10.0 mol % BaSnO 3 , 4.0 mol % CaSnO 3 , 2.5 mol % SrTiO 3 , 0.3 mol % Fe 2 O 3 , and 0.2 mol % V 2 O 5 .
Claim 7
Dependent Claim
52 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 83.0 mol % BaTiO 3 , 10.0 mol % BaSnO 3 , 4.0 mol % CaSnO 3 , 2.5 mol % SrTiO 3 , 0.3 mol % Fe 2 O 3 , and 0.2 mol % V 2 O 5 .
Claim 8
Dependent Claim
38 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 84.0 mol % BaTiO 3 , 14.0 mol % BaSnO 3 , 1.7 mol % MgTiO 3 , 0.2 mol SiO.sub. 2, and 0.1 mol % CoO.
Claim 9
Dependent Claim
38 words
An improved temperature compensating capacitor comprising a ceramic consisting essentially of 84.0 mol % BaTiO 3 , 14.0 mol % BaSnO 3 , 1.7 mol % MgTiO 3 , 0.2 mol SiO.sub. 2, and 0.1 mol % CoO.
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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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |