Patent US2957936A successfully refreshed from Google Patents.
US2957936A
Expired / Lapsed
US
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Electric smelting furnace with bottom tapping hole
Assignee: Elektrokemisk AS
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Filing: 1958-07-31
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Granted: 1960-10-25
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Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Bugge Nils Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:04
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27D; F27D3/00; F27D3/15; F27D3/1509
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US284005A
Cited
US343954A
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US1360520A
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US977271A
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US1286632A
Cited
US2045073A
Cited
US2085450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |