Patent US3872582A successfully refreshed from Google Patents.
US3872582A
Expired / Lapsed
US
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Process for making a voltage dependent resistor
Assignee: Panasonic Holdings Corp
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Filing: 1973-12-27
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Granted: 1975-03-25
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Expires: 1993-12-27
Abstract
Abstract A process for making a voltage dependent resistor which has a zinc oxide sintered body which itself has voltage dependent properties. The process is made up of the steps of: (1) providing a formed body of a powder mixture having as a major part zinc oxide and additive; (2) coating on the side surfaces of the formed body a paste having as the solid ingredient composition at least one member selected from the group of a) more than 50 mole % of silicon dioxide (SiO2), and less than 50 mole % of bismuth oxide (Bi2O3), b) the same composition as that of said additive, c) more than 30 mole percent of antimony oxide (Sb2O3) and less than 70 mole percent of bismuth oxide (Bi2O3), and d) more than 50 mole percent of indium oxide (In2O3) and less than 50 mole percent of bismuth oxide (Bi2O3); (3) sintering the coated body; and (4) applying electrodes to opposite surfaces of the sintered body.
Inventors
- 👤 Michio Matsuoka
- 👤 Gen Itakura
- 👤 Atsushi Iga
- 👤 Takeshi Masuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:18
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/102; H01B; H01B1/00; H01B1/06; H01B1/08; H01C17/00; H01C17/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A PROCESS FOR MAKING A VOLTAGE DEPENDENT RESISTOR COMPRISED OF A ZINC OXIDE SINTERED BODY WHICH ITSELF HAS VOLTAGE DEPENDENT PROPERTIES, SAID PROCESS COMPRISING: (1) PROVIDING A FORMED BODY OF POWDER MIXTURE COMPRISING, AS A MAJOR PART, ZINC OXIDE AND THE REMAINDER BEING AN ADDITIVE, (2) COATING ON THE SIDE SURFACE OF SAID BODY A PASTE HAVING A SOLID INGREDIENT COMPOSITION OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF A) MORE THAN 50 MOLE PERCENT OF SILICON DIOXIDE (SIO2) AND LESS THAN 50 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), THE SAME COMPOSITION AS THAT OF SAID ADDITIVE, C) MORE THAN 30 MOLE PERCENT OF ANTIMONY OXIDE (SB2O3) AND LESS THAN 70 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), AND D) MORE THAN 50 MOLE PERCENT OF INDIUM OXIDE (IN2O3) AND LESS THAN 50 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), (3) SINTERING SAID COATED BODY, AND (4) APPLYING TWO ELECTRODES TO THE OPPOSITE END SURFCES OF SAID SINTERED BODY.
Claim 2
Dependent Claim
160 words
A PROCESS FOR MAKING A VOLTAGE DEPENDENT RESISTOR COMPRISED OF A ZINC OXIDE SINTERED BODY WHICH ITSELF HAS VOLTAGE DEPENDENT PROPERTIES, SAID PROCESS COMPRISING: (1) PROVIDING A FORMED BODY OF POWDER MIXTURE COMPRISING, AS A MAJOR PART, ZINC OXIDE AND THE REMAINDER BEING AN ADDITIVE, (2) COATING ON THE SIDE SURFACE OF SAID BODY A PASTE HAVING A SOLID INGREDIENT COMPOSITION OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF A) MORE THAN 50 MOLE PERCENT OF SILICON DIOXIDE (SIO2) AND LESS THAN 50 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), THE SAME COMPOSITION AS THAT OF SAID ADDITIVE, C) MORE THAN 30 MOLE PERCENT OF ANTIMONY OXIDE (SB2O3) AND LESS THAN 70 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), AND D) MORE THAN 50 MOLE PERCENT OF INDIUM OXIDE (IN2O3) AND LESS THAN 50 MOLE PERCENT OF BISMUTH OXIDE (BI2O3), (3) SINTERING SAID COATED BODY, AND (4) APPLYING TWO ELECTRODES TO THE OPPOSITE END SURFCES OF SAID SINTERED BODY.
Claim 3
Dependent Claim
36 words
A process according to claim 1, in which the coating paste has a solid ingredient composition of 70 to 95 mole percent of silicon dioxide (SiO2) and 30 to 5 mole percent of bismuth oxide (Bi2O3).
Claim 4
Dependent Claim
36 words
A process according to claim 1, in which the coating paste has a solid ingredient composition of 70 to 95 mole percent of antimony oxide (Sb2O3) and 30 to 5 mole percent of bismuth oxide (Bi2O3).
Claim 5
Dependent Claim
45 words
A process according to claim 1, in which the coating paste has a solid ingredient composition of 50 to 95 mole percent of silicon dioxide (SiO2), 2 to 45 mole percent of antimony oxide (Sb2O3) and 2 to 20 mole percent of bismuth oxide (Bi2O3).
Claim 6
Dependent Claim
75 words
A process according to claim 1 which said powder mixture consists essentially of, as a major part, 99.9 to 80.0 mole percent of zinc oxide (ZnO) and, as an additive, 0.05 to 10.0 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 cobalt oxide (CoO), manganese oxide (MnO) antimony oxide (Sb2O3), barium oxide (BaO), strontium oxide (SrO) and lead oxide (PbO).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |