US4460936A
Expired / Lapsed
US
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Condenser
Assignee: Suwa Seikosha KK
•
Filing: 1981-02-03
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Granted: 1984-07-17
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Expires: 2001-02-03
Abstract
Abstract A condenser including a dielectric material exhibiting a ferroelectric phase wherein the dielectric constant-temperature characteristic of the condenser exhibits hysteresis loss of not more than 5% is provided. The dielectric constant-temperature characteristics are varied by regulating the particle diameter of the crystal and by providing an electrode material which reduces the loss. Hysteresis loss may also be reduced by including an oxide of a rare earth element or a metallic element of Group Va of the Periodic Table into a barium titanate dielectric component system.
Inventors
- 👤 Kuniharu Yamada
- 👤 Yoshiyuki Gomi
- 👤 Tsuneo Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:32
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/018; H01G4/06; H01G4/08; H01G4/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A condenser having a hystersis effect of dielectric constant-temperature characteristic of less than 5%, comprising a barium titanate ceramic dielectric including a main component system selected from the group consisting of BaCO 3 -TiO 2 -SrCO 3 and BaCO 3 -TiO 2 -SnO 2 including from about 0.01 to 1% by weight of at least one oxide selected from the group consisting of an oxide of a rare earth element and an oxide of a metallic element of Group Va of the Periodic Table.
Claim 2
Dependent Claim
84 words
A condenser having a hystersis effect of dielectric constant-temperature characteristic of less than 5%, comprising a barium titanate ceramic dielectric including a main component system selected from the group consisting of BaCO 3 -TiO 2 -SrCO 3 and BaCO 3 -TiO 2 -SnO 2 including from about 0.01 to 1% by weight of at least one oxide selected from the group consisting of an oxide of a rare earth element and an oxide of a metallic element of Group Va of the Periodic Table.
Claim 3
Dependent Claim
19 words
The condenser of claim 1, wherein said at least one oxide is an oxide of a rare earth element.
Claim 4
Dependent Claim
18 words
The condenser of claim 2, wherein said main component system is BaCO 3 -TiO 2 -SrCO 3 .
Claim 5
Dependent Claim
18 words
The condenser of claim 2, wherein said main component system is BaCO 3 -TiO 2 -SnO 2 .
Claim 6
Dependent Claim
22 words
The condenser of claims 2, 3 or 4, wherein said oxide of a rare earth element is Dy 2 O 3 .
Claim 7
Dependent Claim
20 words
The condenser of claim 1, wherein the diameter of the crystal of said dielectic material is not more than 1.5μ.
Claim 8
Dependent Claim
25 words
The condenser of claim 1, wherein said at least one oxide is an oxide of a metallic element of Group Va of the Periodic Table.
Claim 9
Dependent Claim
18 words
The condenser of claim 7, wherein said oxide of a metallic element is V 2 O 5 .
Claim 10
Dependent Claim
18 words
The condenser of claim 7, wherein said oxide of a metallic element is Nb 2 O 5 .
Claim 11
Dependent Claim
52 words
The condenser of claim 1, wherein the dielectric has external exposed surfaces with at least a portion of said external surfaces having an electrode selected from the group consisting of Cr, SnO 2 , In 2 O 3 , chromium alloys and carbon disposed thereon by one of vacuum evaporation and spattering.
References Cited (Backward Citations)
US2946937A
Cited
DE1117766B
Cited
US3255395A
Cited
US3920781A
Cited
US4086649A
Cited
US4097911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |