US2860257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for balancing induction furnace phase currents
Assignee: Demag Elektrometallurgie GmbH
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Filing: 1957-10-14
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Granted: 1958-11-11
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Expires: 1977-10-14
Abstract
No abstract record available.
Inventors
- 👤 Tellmann Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/26; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/08; Y; Y02; Y02E; Y02E40/00; Y02E40/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |