Patent US2868860A successfully refreshed from Google Patents.
US2868860A
Expired / Lapsed
US
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Furnace for steel production
Assignee: Elektrokemisk AS
•
Filing: 1955-08-08
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Granted: 1959-01-13
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Expires: 1975-08-08
Abstract
No abstract record available.
Inventors
- 👤 Foyn Kjeld
- 👤 Gornitzka Einar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1113778A
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US1499020A
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US1626263A
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US1735419A
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US2119262A
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US2334275A
Cited
US2343443A
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US2382534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |