Patent US2478414A successfully refreshed from Google Patents.
US2478414A
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Breakdown testing apparatus
Assignee: AT&T Inc
•
Filing: 1944-01-07
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Granted: 1949-08-09
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Expires: 1964-01-07
Abstract
No abstract record available.
Inventors
- 👤 Leon V Michal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494239A
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US1506761A
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US1561483A
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US1514555A
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US1903496A
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US1950484A
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US2094645A
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US2245603A
Cited
US2328107A
Cited
US2400751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |