US2814658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace
Assignee: Strategic Udy Metallurg & Chem
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Filing: 1954-02-15
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Granted: 1957-11-26
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Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Marvin J Udy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:53
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; C; C01; C01B; C01B32/00; C01B32/90; C22; C22B; C22B4/00; C22B4/08; F27B; F27B3/00; F27B3/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |