US3760318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a voltage dependent resistor
Assignee: Panasonic Holdings Corp
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Filing: 1972-08-24
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Granted: 1973-09-18
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Expires: 1992-08-24
Abstract
Abstract A voltage dependent resistor comprising a sintered body of zinc oxide having: (1). voltage dependent properties by itself, (2). at least one member selected from the group consisting of L: ions and Na ions diffused in the side surface thereof, and (3). two electrodes applies to the opposite surfaces thereof. The invention also provides a process for making said resistor.
Inventors
- 👤 T Masuyama
- 👤 M Matsuura
- 👤 A Iga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:56
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A process for making a voltage dependent resistor comprising zinc oxide sintered body having voltage dependent properties by itself, said process comprising: (1.) providing zinc oxide sintered body having voltage dependent properties by itself, (2) diffusing Li ions into said zinc oxide sintered body from the side surface of said zinc oxide sintered body, and (3.) applying two electrodes to the opposite surfaces of said zinc oxide sintered body.
Claim 2
Dependent Claim
79 words
A process according to claim 1, in which said zinc oxide sintered body consists essentially of, as a major part, 99.9 to 80.0 mole percent of zinc oxide, and, as an additive, 0.05 to 10.0 mole percent of bismuth oxide (Bi2O3) and 0.05 to 10.0 mole percent, in total, of at least one member selected from the group consisting of cobalt oxide (CoO), manganese oxide (MnO), antimony oxide (Sb2O3), barium oxide (BaO), strontium oxiDe (SrO) and lead oxide (PbO).
Claim 3
Dependent Claim
38 words
A process according to claim 1, in which said Li ions or Na ions are diffused into said sintered body to the depth not less than 0.01 mm from the side surface of said zinc oxide sintered body.
Claim 4
Dependent Claim
76 words
A process according to claim 2, in which said Li ions are diffused by applying a paste comprises, as a solid ingredient, 0.5 to 10.0 wt. parts of Li2O and at least one member selected from the group consisting of 0.01 to 10.0 wt. parts of CoO, 0.01 to 10.0 wt. parts of MnO, 0.01 to 10.0 wt. parts of Ag2O, 0.01 to 10.0 wt. parts of Cr2O3 and 0.01 to 10.0 wt. parts of NiO.
Claim 5
Dependent Claim
64 words
A process according to claim 5, in which said paste comprises, as a solid ingredient, 0.5 to 10.0 wt. percent of lithium oxide (Li2O), 3.0 to 35.0 wt. percent of boron trioxide (B2O3), 5.0 to 43.0 wt. percent of silicon dioxide (SiO2) and 12.0 to 91.5 wt. percent of one member selected from the group consisting of bismuth oxide (Bi2O3) and lead oxide (PbO).
Claim 6
Dependent Claim
43 words
A process according to claim 5, in which said paste comprises, as a solid ingredient, 0.8 to 10.0 wt. percent of lithium oxide (Li2O), 50.0 to 80.0 wt. percent of barium oxide (BaO) and 10.0 to 40.0 wt. percent of boron trioxide (B2O3).
Claim 7
Dependent Claim
30 words
A process according to claim 5, in which said paste comprises, as a solid ingredient, 1.0 to 2.5 wt. parts of Li2O and 1.0 to 3.0 wt. parts of K2O.
Claim 8
Dependent Claim
48 words
A voltage dependent resistor comprising zinc oxide sintered body having: (1.) voltage dependent properties by itself, (2.) at least one member selected from the group consisting of Li ions and Na ions diffused in the side surface thereof, and (3.) two electrodes applied to the opposite surfaces thereof.
Claim 9
Dependent Claim
35 words
A voltage dependent resistor comprising zinc oxide sintered body having: (1.) voltage dependent properties by itself, (2.) Li ions diffused in the side surface thereof, and (3.) two electrodes applied to the opposite surfaces thereof.
Claim 10
Dependent Claim
81 words
A voltage dependent resistor accroding to claim 9, in which said zinc oxide sintered body consists essentially of, as a major part, 99.9 to 80.0 mole percent of zinc oxide, and, as an additive, 0.05 to 10.0 mole percnet of bismuth oxide (Bi2O3) and 0.05 to 10.0 mole percent, in total, of at least one member selected from the group consisting of cobalt oxide (CoO), manganese oxide (MnO), antimony oxide (Sb2O3), barium oxide (BaO), strontium oxide (SrO) and lead oxide (PbO).
Claim 11
Dependent Claim
42 words
A voltage dependent resistor according to claim 9, in which the depth of said Li ions or Na ions diffused in said zinc oxide sintered body is not less than 0.01 mm from the side surface of said zinc oxide sintered body.
References Cited (Backward Citations)
US3503029A
Cited
US3611070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |