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Patent US2816947A successfully refreshed from Google Patents.
US2816947A
Expired / Lapsed
US
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Transformer tank
Assignee: Reliance Electric and Engineering Co
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Filing: 1953-06-26
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Granted: 1957-12-17
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Expires: 1973-06-26
Abstract
No abstract record available.
Inventors
- 👤 Donald B Leightner
- 👤 Robert R Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:46
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |