Patent US3449537A successfully refreshed from Google Patents.
US3449537A
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US
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Circuit breaker for interrupting at zero current and automatically reclosing after unsuccessful interruption
Assignee: Siemens AG
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Filing: 1967-12-12
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Granted: 1969-06-10
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Expires: 1987-12-12
Abstract
No abstract record available.
Inventors
- 👤 Fritz Kesselring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:36
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/22; H02H7/222; H01; H01H; H01H33/00; H01H33/02; H01H33/59; H01H33/593
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB422775A
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US2196868A
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GB718895A
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US2672541A
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DE897872C
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US2849659A
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US2951188A
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US2904660A
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US2898421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |