US3899451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide varistor
Assignee: Toshiba Corp
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Filing: 1973-09-11
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Granted: 1975-08-12
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Expires: 1993-09-11
Abstract
Abstract An oxide varistor is prepared from a basic composition formed of 70 to 14 mol% of at least one MeIO2, 29 to 85 mol% of ZnO and 1 to 20 mol% of Sb2O3, 1 to 20% by weight of Bi2O3, and 0.5 to 10% by weight of at least one MeII2O3 based on said basic composition, MeI being selected from Ti, Sn and Zr, and MeII being selected from Fe, Cr, Mn and Co.
Inventors
- 👤 Noboru Ichinose
- 👤 Yuhji Yokomizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:07
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
AN AXIDE VARISTOR PREPARED FROM A BASIC COMPOSITION CONSISTING OF A TOTAL OF 70 TO 14 MOL % OF AT LEAST ONE COMPOUND OF THE FORMULA MCIO2, 29 TO 85 MOL % OF ZNO AND 1 TO 20 MOL % OF SB2O3, AND CONTAINING 1 TO 20 % BY WEIGHT OF BI2O3, AND A TOTAL OF 0.5 TO 10 % BY WEIGHT OF AT LEAST ONE MEII2O3 BASED ON THE WEIGHT OF SAID BASIC COMPOSITION, WHEREIN SAID MEI IS SELECTED FROM THE GROUP CONSISTING OF TI, SN AND ZR, SAID MEII IS SELECTED FROM THE GROUP CONSISTING OF FE, CR, MN AND CO.
Claim 2
Dependent Claim
103 words
AN AXIDE VARISTOR PREPARED FROM A BASIC COMPOSITION CONSISTING OF A TOTAL OF 70 TO 14 MOL % OF AT LEAST ONE COMPOUND OF THE FORMULA MCIO2, 29 TO 85 MOL % OF ZNO AND 1 TO 20 MOL % OF SB2O3, AND CONTAINING 1 TO 20 % BY WEIGHT OF BI2O3, AND A TOTAL OF 0.5 TO 10 % BY WEIGHT OF AT LEAST ONE MEII2O3 BASED ON THE WEIGHT OF SAID BASIC COMPOSITION, WHEREIN SAID MEI IS SELECTED FROM THE GROUP CONSISTING OF TI, SN AND ZR, SAID MEII IS SELECTED FROM THE GROUP CONSISTING OF FE, CR, MN AND CO.
Claim 3
Dependent Claim
35 words
The oxide varistor according to claim 1 wherein said basic composition consists of 60 to 30 mol % of MeIO2, 35 to 57 mol % of ZnO and 5 to 15 mol % of Sb2O3.
Claim 4
Dependent Claim
39 words
The oxide varistor according to claim 1, wherein the amount of said MeIO2 of the basic composition is 20 to 14 mol % and the amount of said ZnO of the basic composition is 66 to 85 mol %.
Claim 5
Dependent Claim
37 words
The oxide varistor according to claim 1, wherein the amount of said MeIO2 of the basic composition is about 70 mol % and the amount of said ZnO of the basic composition is about 30 mol %.
Claim 6
Dependent Claim
139 words
An oxide varistor having a nonlinear voltage coefficient ( Alpha ) greater than 30, a change with temperature in rising voltage of less than -0.003%/*C and a surge resistance of more than 3,000 A/cm2, said oxide varistor being prepared from a basic composition consisting of a total of 70 to 14 mol % of at least one compound of the formula MeIO2, 29 to 85 mol % of ZnO and 1 to 20 mol % of Sb2O3, and containing 1 to 20 % by weight of Bi2O3, and a total of 0.5 to 10 % by weight of at least one MeII2O3 based on the weight of said basic composition, wherein said MeI is selected from the group consisting of Ti, Sn and Zr, and said MeII is selected from the group consisting of Fe, Cr, Mn and Co.
Claim 7
Dependent Claim
139 words
An oxide varistor having a nonlinear voltage coefficient ( Alpha ) greater than 30, a change with temperature in rising voltage of less than -0.003%/*C and a surge resistance of more than 3,000 A/cm2, said oxide varistor being prepared from a basic composition consisting of a total of 70 to 14 mol % of at least one compound of the formula MeIO2, 29 to 85 mol % of ZnO and 1 to 20 mol % of Sb2O3, and containing 1 to 20 % by weight of Bi2O3, and a total of 0.5 to 10 % by weight of at least one MeII2O3 based on the weight of said basic composition, wherein said MeI is selected from the group consisting of Ti, Sn and Zr, and said MeII is selected from the group consisting of Fe, Cr, Mn and Co.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |