US5235310A
Expired / Lapsed
US
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Varistor having interleaved electrodes
Assignee: ECCO Ltd
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Filing: 1990-06-26
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Granted: 1993-08-10
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Expires: 2010-06-26
Abstract
Abstract A multilayer varistor has interleaved layers of ceramic material and electrode material. Each electrode layer is sandwiched between two ceramic layers. The ceramic material includes zinc oxide, ceramic structure influencing additives selected from the group consisting of bismuth oxide, boron oxide, chromium oxide, cobalt oxide, manganese oxide and tin oxide, and a grain growth influencing additive selected from the group consisting of antimony oxide, silicon dioxide and titanium dioxide.
Inventors
- 👤 Stephen P. Cowman
- 👤 Ramon Puyane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:42
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A varistor comprising a plurality of layers of ceramic material and a plurality of layers of electrode material, said layers being interleaved, with each electrode material layer being sandwiched between and extending across the entire length of the two ceramic material layers, wherein at least one of said ceramic layers comprises: zinc oxide; a plurality of ceramic structure influencing additives selected from the group consisting of at least bismuth oxide, boron oxide, chromium oxide, cobalt oxide, manganese oxide, and tin oxide; and at least one grain growth influencing additives selected from the group consisting of at least antimony oxide, silicon dioxide and titanium dioxide.
Claim 2
Dependent Claim
104 words
A varistor comprising a plurality of layers of ceramic material and a plurality of layers of electrode material, said layers being interleaved, with each electrode material layer being sandwiched between and extending across the entire length of the two ceramic material layers, wherein at least one of said ceramic layers comprises: zinc oxide; a plurality of ceramic structure influencing additives selected from the group consisting of at least bismuth oxide, boron oxide, chromium oxide, cobalt oxide, manganese oxide, and tin oxide; and at least one grain growth influencing additives selected from the group consisting of at least antimony oxide, silicon dioxide and titanium dioxide.
Claim 3
Dependent Claim
24 words
A varistor according to claim 1, wherein said plurality of ceramic structure influencing additives includes at least bismuth oxide, cobalt oxide and manganese oxide.
Claim 4
Dependent Claim
36 words
A varistor according to claim 1, wherein said at least one of said ceramic layers comprises at least one electrical performance influencing additive selected from the group consisting of at least aluminum oxide and silver oxide.
Claim 5
Dependent Claim
36 words
A varistor according to claim 2, wherein said at least one of said ceramic layers comprises at least one electrical performance influencing additive selected from the group consisting of at least aluminum oxide and silver oxide.
Claim 6
Dependent Claim
22 words
A varistor according to claim 1, wherein said at least one of said ceramic layers comprises nickel oxide as a further additive.
Claim 7
Dependent Claim
36 words
A varistor according to claim 2, wherein said at least one of said ceramic layers comprises at least one electrical performance influencing additive selected from the group consisting of at least aluminum oxide and silver oxide.
Claim 8
Dependent Claim
36 words
A varistor according to claim 3, wherein said at least one of said ceramic layers comprises at least one electrical performance influencing additive selected from the group consisting of at least aluminum oxide and silver oxide.
Claim 9
Dependent Claim
36 words
A varistor according to claim 4, wherein said at least one of said ceramic layers comprises at least one electrical performance influencing additive selected from the group consisting of at least aluminum oxide and silver oxide.
Claim 10
Dependent Claim
22 words
A varistor according to claim 1, wherein said at least one of said ceramic layers comprises magnesium oxide as an additional additive.
Claim 11
Dependent Claim
22 words
A varistor according to claim 2, wherein said at least one of aid ceramic layers comprises magnesium oxide as an additional additive.
Claim 12
Dependent Claim
22 words
A varistor according to claim 3, wherein said at least one of said ceramic layers comprises magnesium oxide as an additional additive.
Claim 13
Dependent Claim
22 words
A varistor according to claim 4, wherein said at least one of said ceramic layers comprises magnesium oxide as an additional additive.
Claim 14
Dependent Claim
22 words
A varistor according to claim 5, wherein said at least one of said ceramic layers comprises magnesium oxide as an additional additive.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |