US3838378A
Expired / Lapsed
US
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Voltage-nonlinear resistors
Assignee: Panasonic Holdings Corp
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Filing: 1973-07-26
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Granted: 1974-09-24
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Expires: 1993-07-26
Abstract
Abstract The invention relates to voltage-nonlinear resistors having nonohmic resistance due to the bulk thereof and more particularly to varistors, are suitable for use as elements of lightning arresters, comprising zinc oxide, bismuth oxide, antimony oxide and cerium fluoride.
Inventors
- 👤 Michio Matsuoka
- 👤 Takeshi Masuyama
- 👤 Yoshikazu Kobayashi
- 👤 Gen Itakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:52
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A voltage-nonlinear resistor defined by claim 1, wherein said sintered body further includes one member selected from the group consisting of 0.1 to 3.0 mole percent of cobalt oxide (CoO) and 0.1 to 3.0 mole percent of manganese oxide (MnO).
Claim 2
Dependent Claim
68 words
A voltage-nonlinear resistor defined by claim 1, wherein said sintered body further includes 0.1 to 3.0 mole percent of cobalt oxide (CoO), 0.1 to 3.0 mole percent of manganese oxide (MnO) and one member selected from the group consisting of 0.05 to 3.0 mole percent of chromium oxide (Cr2O3), 0.1 to 3.0 mole percent of tin oxide (SnO2) and 0.1 to 10.0 mole percent of silicon dioxide (SiO2).
Claim 3
Dependent Claim
87 words
A voltage-nonlinear resistor defined by claim 1, wherein said sintered body consisting essentially of 99.4 to 72.0 mole percent of zinc oxide (ZnO) 0.1 to 3.0 mole percent of bismuth oxide (Bi2O3), 0.05 to 3.0 mole percent of antimony oxide (Sb2O3), 0.1 to 3.0 mole percent of cerium fluoride (CeF3), 0.1 to 3.0 mole percent of cobalt oxide (CoO), 0.1 to 3.0 mole percent of manganese oxide (MnO), 0.05 to 3.0 mole percent of chromium oxide (Cr2O3) and 0.1 to 10.0 mole percent of silicon dioxide (SiO2).
Claim 4
Dependent Claim
15 words
An arrester comprising at least one voltage-nonlinear resistor of claim 1 as a characteristic element.
Claim 5
Dependent Claim
15 words
An arrester comprising at least one voltage-nonlinear resistor of claim 4 as a characteristic element.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |