US2639309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for transformers with oil reservoir
Assignee: SAVOISIENNE CONST ELEC
•
Filing: 1951-02-28
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Granted: 1953-05-19
•
Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 Egger Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:00
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/12; H01F27/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1508201A
Cited
US1642398A
Cited
US1794893A
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US1642408A
Cited
US1723916A
Cited
US2274388A
Cited
US2447883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |