US3705281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bushing insulator improvements for a dead tank vacuum switch
Assignee: Joslyn Manufacturing and Supply Co
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Filing: 1971-04-29
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Granted: 1972-12-05
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Expires: 1991-04-29
Abstract
Abstract A vacuum switch is of the type having a metallic or other material electrically dead enclosure through which one or more conductive terminal leads extend. Interposed between each terminal lead and enclosure is a respective, preferably ceramic, insulator bushing. Annular, semi-flexible metal sealing means are at one limit embedded in (or could be sealed to) the insulator ceramic and at other limits metal-to-metal secured to an enclosure tank part and metal-to-metal secured to terminal lead. Metal support means for metal condensing shields may extend from embedment in the ceramic material and be metal-to-metal bonded similarly.
Inventors
- 👤 Elmer L Luehring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66238; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/301; H01H33/66261; H01H2033/66292
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB1125705A
Cited
US3590185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |