Patent US4060661A successfully refreshed from Google Patents.
US4060661A
Expired / Lapsed
US
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Voltage-dependent resistor
Assignee: Panasonic Holdings Corp
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Filing: 1976-08-04
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Granted: 1977-11-29
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Expires: 1996-08-04
Abstract
Abstract There is provided a voltage-dependent resistor comprising a bulk consisting essentially of zinc oxide as the major part and as additives 0.01 to 10 mol % of Bi 2 O 3 , CoO, MnO, TiO and NiO and electrodes on the bulk, said electrodes having been formed by baking a silver paste comprising silver powder and a glass frit on the bulk, said glass frit containing as its principal content 80 to 95% by weight of Bi 2 O 3 and correspondingly 20 to 5% by weight of SiO 2 , said glass frit also containing 1 to 5 parts by weight of B 2 O 3 for 100 parts of said principal content. The electrodes can also contain minor amounts of CoO, Sb 2 O 3 , a mixture of Sb 2 O 3 with Ag 2 O or MgO, or a mixture of CoO with MgO or Ag 2 O.
Inventors
- 👤 Akihiro Takami
- 👤 Takayuki Kuroda
- 👤 Katsuo Nagano
- 👤 Michio Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:49
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/06546; H01C17/28; H01C17/281; H01C17/283; H01C17/285
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A voltage-dependent resistor comprising a bulk consisting mainly of zinc oxide as a major part and, as additives, 0.01 to 10 mol % of Bi 2 O 3 , CoO, MnO, TiO and NiO, respectively and electrodes on said bulk, said electrodes having been formed by baking a silver paste comprising silver powder and a glass frit on said bulk, said glass frit containing as its principal contents 80 to 95% by weight of Bi 2 O 3 and correspondingly 20 to 5% by weight of SiO 2 said glass frit also containing 1 to 5 parts by weight of B 2 O 3 per 100 parts of said principal contents.
Claim 2
Dependent Claim
111 words
A voltage-dependent resistor comprising a bulk consisting mainly of zinc oxide as a major part and, as additives, 0.01 to 10 mol % of Bi 2 O 3 , CoO, MnO, TiO and NiO, respectively and electrodes on said bulk, said electrodes having been formed by baking a silver paste comprising silver powder and a glass frit on said bulk, said glass frit containing as its principal contents 80 to 95% by weight of Bi 2 O 3 and correspondingly 20 to 5% by weight of SiO 2 said glass frit also containing 1 to 5 parts by weight of B 2 O 3 per 100 parts of said principal contents.
Claim 3
Dependent Claim
36 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of CoO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 4
Dependent Claim
39 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of Sb 2 O 3 per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 5
Dependent Claim
50 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of Sb 2 O 3 and 5 to 35 parts by weight of Ag 2 O per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 6
Dependent Claim
48 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of Sb 2 O 3 and 2 to 20 parts by weight of MgO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 7
Dependent Claim
45 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of CoO and 2 to 20 parts by weight of MgO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 8
Dependent Claim
47 words
A voltage-dependent resistor according to claim 1 wherein said glass frit also contains 2 to 30 parts by weight of CoO and 5 to 35 parts by weight of Ag 2 O per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 9
Dependent Claim
27 words
A voltage-dependent resistor according to claim 1 wherein the silver powder is from 200 to 800 parts by weight per 100 parts by weight of glass frit.
Claim 10
Independent Claim
151 words
A method of making a voltage-dependent resistor comprising the steps of mixing 80 to 95% by weight of Bi 2 O 3 powder and 5 to 20% by weight of SiO 2 powder to form a mixture, adding 1 to 5 parts by weight of B 2 O 3 to 100 parts by weight of said mixture as an additive, further mixing said mixture and additive, firing them and pulverizing the fired mixture to form a glass frit, mixing the glass frit, silver powder, synthetic resin and solvent together and kneading to form a silver paste, applying said silver paste to form coatings on both principal faces of a varistor bulk which consists mainly of zinc oxide as a major part and, as additives, 0.01 to 10 mol % of Bi 2 O 3 , CoO, MnO 2 TiO 2 and NiO, respectively, and baking the varistor bulk with said coatings.
Claim 11
Independent Claim
151 words
A method of making a voltage-dependent resistor comprising the steps of mixing 80 to 95% by weight of Bi 2 O 3 powder and 5 to 20% by weight of SiO 2 powder to form a mixture, adding 1 to 5 parts by weight of B 2 O 3 to 100 parts by weight of said mixture as an additive, further mixing said mixture and additive, firing them and pulverizing the fired mixture to form a glass frit, mixing the glass frit, silver powder, synthetic resin and solvent together and kneading to form a silver paste, applying said silver paste to form coatings on both principal faces of a varistor bulk which consists mainly of zinc oxide as a major part and, as additives, 0.01 to 10 mol % of Bi 2 O 3 , CoO, MnO 2 TiO 2 and NiO, respectively, and baking the varistor bulk with said coatings.
Claim 12
Dependent Claim
38 words
The method of claim 9 wherein the making said glass frit there is also employed 2 to 30 parts by weight of CoO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 13
Dependent Claim
41 words
The method of claim 9 wherein in making said glass frit there is also employed 2 to 30 parts by weight of Sb 2 O 3 per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 14
Dependent Claim
52 words
The method of claim 9 wherein in making said glass frit there is also employed 2 to 30 parts by weight of Sb 2 O 3 and 5 to 35 parts by weight of Ag 2 O per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 15
Dependent Claim
50 words
The method of claim 9 wherein in making said glass frit there is also employed 2 to 30 parts by weight of Sb 2 O 3 and 2 to 20 parts by weight of MgO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 16
Dependent Claim
47 words
The method of claim 9 wherein in making said glass frit there is also employed 2 to 30 parts by weight of CoO and 2 to 20 parts by weight of MgO per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 17
Dependent Claim
49 words
The method of claim 9 wherein in making said glass frit there is also employed 2 to 30 parts by weight of CoO and 5 to 35 parts by weight of Ag 2 O per 100 parts by weight of total Bi 2 O 3 and SiO 2 .
Claim 18
Dependent Claim
28 words
The method of claim 9 wherein the silver powder employed is from 200 to 800 parts by weight per 100 parts by weight of glass frit forming material.
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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |