US3670221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage variable resistors
Assignee: Panasonic Holdings Corp
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Filing: 1969-11-28
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Granted: 1972-06-13
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Expires: 1989-11-28
Abstract
Abstract Voltage variable resistors comprising a sintered wafer consisting essentially of zinc oxide (ZnO), 0.05 to 8.0 mole percent of bismuth oxide (Bi2O3) and 0.05 to 10.0 mole percent of at least one member selected from the group consisting of niobium oxide (Nb2O5), zirconium oxide (ZrO2), vanadium oxide (V2O5) and tungusten oxide (WO3) and two electrodes applied to opposite surfaces of said sintered wafer, at least one of said two electrodes being a silver paint electrode.
Inventors
- 👤 Kazuo Hamamoto
- 👤 Michio Matsuoka
- 👤 Takeshi Masuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:17
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; H01B; H01B1/00; H01B1/06; H01B1/08; H01C17/00; H01C17/28; H01C17/281; H01C17/283; H01C17/285
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A voltage variable resistor according to claim 1, wherein one of said electrodes is a silver paint electrode and the other is an ohmic electrode.
Claim 2
Dependent Claim
60 words
A voltage variable resistor according to claim 1, wherein said sintered wafer consists essentially of 0.1 to 3.0 mole percent of bismuth oxide (Bi2O3) and 0.1 to 3.0 mole percent of at least one member selected from the group consisting of niobium oxide (Nb2O5), zirconium oxide (ZrO2), vanadium oxide (V2O5) and tungusten oxide (WO3), and the remainder zinc oxide (ZnO).
Claim 3
Dependent Claim
53 words
A voltage variable resistor according to claim 1 wherein said silver electrode has a composition consisting essentially of 70 to 99.5 wt. percent of silver, 0.3 to 27 wt. percent of lead oxide (PbO), 0.1 to 15 wt. percent of silicon dioxide (SiO2) and 0.05 to 15 wt. percent of boron trioxide (B2O3).
Claim 4
Dependent Claim
53 words
A voltage variable resistor according to claim 1 wherein said silver electrode has a composition consisting essentially of 70 to 99.5 wt. percent of silver, 0.3 to 27 wt. percent of bismuth oxide (Bi2O3), 0.03 to 15 wt. percent of silicon dioxide (SiO2), and 0.05 to 15 wt. percent of boron trioxide (B2O3).
Claim 5
Dependent Claim
76 words
A voltage variable resistor according to claim 1 wherein said silver electrode has a composition consisting essentially of 70 to 99.5 wt. percent of silver, 0.3 to 27 wt. percent of lead oxide (PbO), 0.1 to 15 wt. percent of silicon dioxide (SiO2), 0.05 to 15 wt. percent of boron trioxide (B2O3) and 0.05 to 6.0 wt. percent of at least one member selected from the group consisting of cobalt oxide (CoO) and manganese oxide (MnO).
Claim 6
Dependent Claim
76 words
A voltage variable resistor according to claim 1 wherein said silver electrode has a composition consisting essentially of 70 to 99.5 wt. percent of silver, 0.3 to 27 wt. percent of bismuth oxide (Bi2O3), 0.03 to 15 wt. percent of silicon dioxide (SiO2), 0.05 to 15 wt. percent of boron trioxide (B2O3) and 0.05 to 6.0 wt. percent of at least one member selected from the group consisting of cobalt oxide (CoO) and manganese oxide (MnO).
References Cited (Backward Citations)
US3505574A
Cited
US3503029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |