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US3396954A
Expired / Lapsed
US
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Gas-curtained electric smelting furnaces and method of collecting reaction gases thereof
Assignee: Elektrokemisk AS
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Filing: 1966-03-11
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Granted: 1968-08-13
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Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 Krogsrud Harald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:13
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; F; F27; F27D; F27D17/00; F27D17/30; F27D17/304
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |