Patent US3771091A successfully refreshed from Google Patents.
US3771091A
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US
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Potted metal oxide varistor
Assignee: General Electric Co
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Filing: 1972-10-31
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Granted: 1973-11-06
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Expires: 1992-10-31
Abstract
Abstract A metal oxide varistor has a high thermal conductivity potting material encapsulating completely the metal oxide varistor and a portion of the leads therefrom, a pair of metal plates spaced in a generally parallel reslationship to the opposite major surfaces of the varistor and bonded thereto by the potting material, and one of the plates having at least a pair of mounting holes therein or other suitable means.
Inventors
- 👤 J Harnden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:14
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/102; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A metal oxide varistor comprising a metal oxide substrate having first and second opposed major surfaces and having an alpha in excess of 10 in the current density range of from 10 3 to 102 amperes per square centimeter, a pair of electrodes having an electrical potential in excess of 20 volts applied therebetween in non-rectifying contact with the respective opposite major surfaces of the substrate, a high thermal conductivity potting material encapsulating one major surface and the edges of the substrate and its associated electrode, and a pair of metal plates spaced in a generally parallel relationship to the opposite major surfaces of the substrate, at least one of said plates being bonded in position by the potting material.
Claim 2
Dependent Claim
120 words
A metal oxide varistor comprising a metal oxide substrate having first and second opposed major surfaces and having an alpha in excess of 10 in the current density range of from 10 3 to 102 amperes per square centimeter, a pair of electrodes having an electrical potential in excess of 20 volts applied therebetween in non-rectifying contact with the respective opposite major surfaces of the substrate, a high thermal conductivity potting material encapsulating one major surface and the edges of the substrate and its associated electrode, and a pair of metal plates spaced in a generally parallel relationship to the opposite major surfaces of the substrate, at least one of said plates being bonded in position by the potting material.
Claim 3
Dependent Claim
61 words
A metal oxide varistor as in claim 1, in which each said electrode has an electrical lead in contact therewith and wherein: the potting material encapsulates additionally the second major surface of the substrate, its associated electrode, and a portion of the associated leads thereby encapsulating completely the substrate, and the second plate is bonded in position by the potting material.
Claim 4
Dependent Claim
20 words
A metal oxide varistor as in claim 1, in which the potting material is a high thermal conductivity epoxy material.
Claim 5
Dependent Claim
21 words
A metal oxide varistor as in claim 1, in which the potting material has a high thermal conductivity ceramic incorporated therein.
Claim 6
Dependent Claim
15 words
A metal oxide varistor as in claim 4, in which the ceramic is boron nitride.
Claim 7
Dependent Claim
14 words
A metal oxide varistor as in claim 1, in which the plates are copper.
Claim 8
Dependent Claim
126 words
A metal oxide varistor comprising a metal oxide substrate having first and second opposed major surfaces and having an alpha in excess of 10 in the current density range of from 10 3 to 102 amperes per square centimeter, a pair of electrodes in non-rectifying contact with the respective opposite major surfaces of the substrate, a high thermal conductivity epoxy potting material including a ceramic selected from the group consisting of beryllium oxide, boron nitride, and aluminum nitride encapsulating one major surface and the edges of the substrate and its associated electrode, and a pair of metal plates spaced in a generally parallel relationship to the opposite major surfaces of the substrate, at least one of said plates being bonded in position by the potting material.
Claim 9
Dependent Claim
126 words
A metal oxide varistor comprising a metal oxide substrate having first and second opposed major surfaces and having an alpha in excess of 10 in the current density range of from 10 3 to 102 amperes per square centimeter, a pair of electrodes in non-rectifying contact with the respective opposite major surfaces of the substrate, a high thermal conductivity epoxy potting material including a ceramic selected from the group consisting of beryllium oxide, boron nitride, and aluminum nitride encapsulating one major surface and the edges of the substrate and its associated electrode, and a pair of metal plates spaced in a generally parallel relationship to the opposite major surfaces of the substrate, at least one of said plates being bonded in position by the potting material.
Claim 10
Dependent Claim
62 words
A metal oxide varistor as in claim 7, in which each of said electrodes has an electrical lead in contact therewith and wherein: the potting material encapsulates additionally the second major surface of the substrate, its associated electrode, and a portion of the associated leads thereby encapsulating completely the substrate, and the second plate is bonded in position by the potting material.
Claim 11
Dependent Claim
15 words
A metal oxide varistor as in claim 7, in which the ceramic is boron nitride.
Claim 12
Dependent Claim
14 words
A metal oxide varistor as in claim 7, in which the plates are copper.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |