US3959543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-linear resistance surge arrester disc collar and glass composition thereof
Assignee: General Electric Co
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Filing: 1974-05-06
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Granted: 1976-05-25
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Expires: 1994-05-06
Abstract
Abstract A zinc oxide compound non-linear resistance surge arrester disc is provided with a glass anti-flashover collar having a relatively low fusing temperature and a relatively low coefficient of thermal expansion. The glass comprises the following constituents in proportion to one-another by weight: About 44.5% lead oxide, About 24.5% zinc oxide, About 20.5% boric oxide, About 4.5% silicon oxide, and About 6.0% cupric oxide.
Inventors
- 👤 Howard F. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:17
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; H; H01; H01C; H01C7/00; H01C7/10; H01C7/102; H01C7/12; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
A non-linear resistance device of the type having a resistance element of predominantly zinc oxide and an insulating coating on a portion of the surface of said element, wherein the improvement comprises that said coating is a glass consisting essentially of: from about 41% to about 48% by weight of lead oxide, from about 22.5% to about 26.5% by weight of zinc oxide, from about 18.5% to about 22.5% by weight of boric oxide, from about 2.5% to about 6.5% by weight of silicon oxide, and from about 4.0% to about 8.0% cupric oxide.
Claim 2
Dependent Claim
94 words
A non-linear resistance device of the type having a resistance element of predominantly zinc oxide and an insulating coating on a portion of the surface of said element, wherein the improvement comprises that said coating is a glass consisting essentially of: from about 41% to about 48% by weight of lead oxide, from about 22.5% to about 26.5% by weight of zinc oxide, from about 18.5% to about 22.5% by weight of boric oxide, from about 2.5% to about 6.5% by weight of silicon oxide, and from about 4.0% to about 8.0% cupric oxide.
Claim 3
Dependent Claim
25 words
The device defined in claim 1 wherein said nonlinear resistance element is a disc having two metallized faces and having said coating about its perimeter.
References Cited (Backward Citations)
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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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |