US2672491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric arc furnace and cover with electrodes and feed conduits
Assignee: Airco Inc
•
Filing: 1951-07-03
•
Granted: 1954-03-16
•
Expires: 1971-07-03
Abstract
No abstract record available.
Inventors
- 👤 Robert H Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:17
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/942
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US842099A
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US1806210A
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US1751177A
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US1972849A
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US1944521A
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US1922312A
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US2447809A
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US2426643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |