Patent US3863193A successfully refreshed from Google Patents.
US3863193A
Expired / Lapsed
US
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Voltage-nonlinear resistors
Assignee: Panasonic Holdings Corp
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Filing: 1973-08-14
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Granted: 1975-01-28
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Expires: 1993-08-14
Abstract
Abstract The invention relates to voltage-nonlinear resistors having nonohmic resistance due to the bulk thereof and more particularly to varistors, which utility as surge absorbers and D.C. stabilizers, comprising zinc oxide, bisumuth oxide, cobalt oxide, boron trioxide and at least one member selected from the group consisting of magnesium oxide, calcium oxide, barium oxide and strontium oxide.
Inventors
- 👤 Mikio Matsuura
- 👤 Atsushi Iga
- 👤 Yasuo Wakahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:22
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A VOLTAGE-NONLINEAR RESISTOR OF THE BULK TYPE COMPRISING A SINTERED BODY CONSISTING ESSENTIALLY OF, AS A MAJOR PART, ZINC OXIDE (ZNO) AND, AS AN ADDITIVE, 0.01 TO 10.0 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), 0.01 TO 10.0 MOLE PERCENT OF COBALT OXIDE (CO203), 0.01 TO 5.0 MOLE PERCENT OF BORON TRIOXIDE (B2O3) AND 0.01 TO 5.0 MOLE PERCENT OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE (MGO), CALCIUM OXIDE (CAO), BARIUM OXIDE (BAO) AND STRONTRIUM OXIDE (SRO) AND ELECTRODES IN CONTACT WITH SAID BODY.
Claim 2
Dependent Claim
89 words
A VOLTAGE-NONLINEAR RESISTOR OF THE BULK TYPE COMPRISING A SINTERED BODY CONSISTING ESSENTIALLY OF, AS A MAJOR PART, ZINC OXIDE (ZNO) AND, AS AN ADDITIVE, 0.01 TO 10.0 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), 0.01 TO 10.0 MOLE PERCENT OF COBALT OXIDE (CO203), 0.01 TO 5.0 MOLE PERCENT OF BORON TRIOXIDE (B2O3) AND 0.01 TO 5.0 MOLE PERCENT OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE (MGO), CALCIUM OXIDE (CAO), BARIUM OXIDE (BAO) AND STRONTRIUM OXIDE (SRO) AND ELECTRODES IN CONTACT WITH SAID BODY.
Claim 3
Dependent Claim
69 words
Voltage-nonlinear resistor according to claim 1, wherein said additive consists essentially of 0.1 to 3.0 mole percent of bismuth oxide (Bi2O3), 0.1 to 3.0 mole percent of cobalt oxide (Co2O3), 0.01 to 5.0 mole percent of boron trioxide (B2O3) and 0.01 to 5.0 mole percent of at least one member selected from the group consisting of magnesium oxide (MgO), calcium oxide (CaO), barium oxide (BaO) and strontium oxide (SrO).
Claim 4
Dependent Claim
24 words
Voltage-nonlinear resistor according to claim 2, wherein said sintered body further includes, as an additive, 0.1 to 3.0 mole percent of manganese oxide (MnO).
Claim 5
Dependent Claim
42 words
Voltage-nonlinear resistor according to claim 3, Wherein said sintered body further includes, as an additive, one member selected from the group consisting of 0.05 to 3.0 mole percent of antimony oxide (Sb2O3) and 0.1 to 3.0 mole percent of titanium oxide (TiO2).
Claim 6
Dependent Claim
54 words
Voltage-nonlinear resistor according to claim 3, wherein said sintered body further includes, as an additive, 0.1 to 3.0 mole percent of titanium oxide (TiO2) and at least one member selected from the group consisting of 0.01 to 3.0 mole percent of chromium oxide (Cr2O3) and 0.1 to 3.0 mole percent of nickel oxide (NiO).
References Cited (Backward Citations)
CA831691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |