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US4535314A
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US
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Varistor includes oxides of bismuth, cobalt, manganese, antimony, nickel and trivalent aluminum
Assignee: Toshiba Corp
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Filing: 1983-12-19
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Granted: 1985-08-13
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Expires: 2003-12-19
Abstract
Abstract A varistor having good voltage-current nonlinear characteristics and a long life performance. The varistor is formed of a sintered body consisting essentially of zinc oxide as a major component, 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 , 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 , 0.1 to 5 mol % of manganese in terms of MnO, 0.1 to 5 mol % of antimony in terms of Sb 2 O 3 , 0.1 to 5 mol % of nickel in terms of NiO, and 0.001 to 0.05 mol % of aluminum in terms of Al 3+ .
Inventors
- 👤 Hideyuki Kanai
- 👤 Takashi Takahashi
- 👤 Motomasa Imai
- 👤 Osamu Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A varistor formed of a sintered body consisting essentially of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO; 0.1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+ .
Claim 2
Dependent Claim
97 words
A varistor formed of a sintered body consisting essentially of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO; 0.1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+ .
Claim 3
Dependent Claim
36 words
The varistor according to claim 1, wherein said sintered body contains a Bi 2 O 3 phase in a ratio R.sub.β exceeding 20%, where R.sub.β =[(quantity of β phase)/{(quantity of β phase) +(quantity of γ phase)}]×100%.
Claim 4
Dependent Claim
57 words
A varistor formed of a sintered body consisting essentially of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO;
Claim 5
Dependent Claim
57 words
A varistor formed of a sintered body consisting essentially of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO;
Claim 6
Dependent Claim
68 words
1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+ wherein said sintered body contains a Bi 2 O 3 phase in a ratio R.sub.β exceeding 90%, wherein R.sub.β =[(quantity of β phase)/{(quantity of β phase)+(quantity of γ phase)}]×100%.
Claim 7
Dependent Claim
68 words
1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+ wherein said sintered body contains a Bi 2 O 3 phase in a ratio R.sub.β exceeding 90%, wherein R.sub.β =[(quantity of β phase)/{(quantity of β phase)+(quantity of γ phase)}]×100%.
Claim 8
Dependent Claim
95 words
A varistor formed of a sintered body consisting of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO; 0.1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+
Claim 9
Dependent Claim
95 words
A varistor formed of a sintered body consisting of: zinc oxide as a major component; 0.1 to 5 mol % of bismuth in terms of Bi 2 O 3 ; 0.1 to 5 mol % of cobalt in terms of Co 2 O 3 ; 0.1 to 5 mol % of manganese in terms of MnO; 0.1 to 5 mol % of antimony in terms of Sb 2 O 3 ; 0.1 to 5 mol % of nickel in terms of NiO; and 0.001 to 0.05 mol % of aluminum in terms of Al 3+
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |