US2789253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of circuit breakers and metallic switches for carrying large currents
Assignee: Individual
•
Filing: 1951-12-28
•
Granted: 1957-04-16
•
Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Vang Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:29
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/54; H01H9/541; H01H9/542
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1421170A
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US1406234A
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US1681196A
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US1792340A
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US2043822A
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US2292174A
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US2537383A
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FR894223A
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US2610231A
Cited
US2665396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |