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US2904609A
Expired / Lapsed
US
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Electrode installation for electric furnaces
Assignee: Christiania Spigerverk AS
•
Filing: 1953-12-31
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Granted: 1959-09-15
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Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 Schjelderup Gunnar
- 👤 Leon J Aasbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:44
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1290902A
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US1534553A
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US1615109A
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US1715376A
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US1742286A
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US1732431A
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US1662850A
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US1793849A
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US2419139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |