US6339367B1
Expired / Lapsed
US
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Laminated chip type varistor
Assignee: TDK Corp
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Filing: 2000-03-24
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Granted: 2002-01-15
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Expires: 2020-03-24
Abstract
Abstract A laminated chip type varistor comprising a varistor function layer, internal electrodes, and terminal electrodes. The varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives. The internal electrodes contain at least one selected from the group consisting of aluminum in the form of Al 2 O 3 with an amount of from 0.0001 to 5.0% by weight, iron in the form of Fe 2 O 3 with an amount of from 0.0001 to 5.0% by weight, and zirconia in the form of ZrO 2 with an amount of from 0.001 to 6.0% by weight as additives with respect to an electrically conductive metal component of a composition for forming layers of the internal electrodes.
Inventors
- 👤 Makikazu Takehana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:19
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
96 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight.
Claim 2
Dependent Claim
96 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight.
Claim 3
Dependent Claim
26 words
The laminated chip type varistor according to claim 1 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 4
Dependent Claim
26 words
The laminated chip type varistor according to claim 1 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 5
Dependent Claim
100 words
The laminated chip type varistor according to claim 1 , wherein said internal electrodes contain at least one selected from the group consisting of aluminum in the form of Al 2 O 3 with an amount of from 0.0001 to 0.5% by weight, iron in the form of Fe 2 O 3 with an amount of from 0.0001 to 0.5% by weight, and zirconia in the form of ZrO 2 with an amount of from 0.001 to 0.5% by weight as additives with respect to the electrically conductive metal component of a composition for forming layers of said internal electrodes.
Claim 6
Dependent Claim
26 words
The laminated chip type varistor according to claim 4 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 7
Dependent Claim
26 words
The laminated chip type varistor according to claim 4 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 8
Dependent Claim
20 words
The laminated chip type varistor according to claim 1 , wherein said internal electrodes contain Al 2 O 3 .
Claim 9
Dependent Claim
26 words
The laminated chip type varistor according to claim 7 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 10
Dependent Claim
26 words
The laminated chip type varistor according to claim 7 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 11
Dependent Claim
20 words
The laminated chip type varistor according to claim 1 , wherein said internal electrodes contain Fe 2 O 3 .
Claim 12
Dependent Claim
26 words
The laminated chip type varistor according to claim 10 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 13
Dependent Claim
26 words
The laminated chip type varistor according to claim 10 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 14
Dependent Claim
18 words
The laminated chip type varistor according to claim 1 , wherein said internal electrodes contain ZrO 2 .
Claim 15
Dependent Claim
26 words
The laminated chip type varistor according to claim 13 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 16
Dependent Claim
26 words
The laminated chip type varistor according to claim 13 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 17
Dependent Claim
115 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight, wherein said internal electrodes contain Al 2 O 3 , Fe 2 O 3 , and ZrO 2 .
Claim 18
Dependent Claim
115 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight, wherein said internal electrodes contain Al 2 O 3 , Fe 2 O 3 , and ZrO 2 .
Claim 19
Dependent Claim
26 words
The laminated chip type varistor according to claim 16 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 20
Dependent Claim
26 words
The laminated chip type varistor according to claim 16 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
Claim 21
Dependent Claim
119 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight, wherein said internal electrodes contain at least two of Al 2 O 3 , Fe 2 O 3 , and ZrO 2 .
Claim 22
Dependent Claim
119 words
A laminated chip type varistor comprising: a varistor function layer; internal electrodes; and terminal electrodes, wherein said varistor function layer has a composition containing zinc oxide as a main component, and cobalt oxide and rare earth elements as additives, and wherein said internal electrodes contain at least one additive selected from the group consisting of Al 2 O 3 in an amount of from 0.0001 to 5.0% by weight, Fe 2 O 3 in an amount of from 0.0001 to 5.0% by weight, and ZrO 2 in an amount of from 0.001 to 6.0% by weight, wherein said internal electrodes contain at least two of Al 2 O 3 , Fe 2 O 3 , and ZrO 2 .
Claim 23
Dependent Claim
26 words
The laminated chip type varistor according to claim 19 , wherein the electrically conductive metal component of said internal electrodes includes palladium as a main component.
Claim 24
Dependent Claim
26 words
The laminated chip type varistor according to claim 19 , wherein the electrically conductive metal component of said internal electrodes includes platinum as a main component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-01-14 | 2005-07-16 | 2006-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-01-14 | 2009-07-16 | 2010-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-01-14 | 2013-07-16 | 2014-01-15 | $7700.00 | Window Closed / Lapsed |