US2767292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power circuit for electric induction furnaces
Assignee: LOMBARD CORP
•
Filing: 1953-12-17
•
Granted: 1956-10-16
•
Expires: 1973-12-17
Abstract
No abstract record available.
Inventors
- 👤 Oliver A Hartzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:38
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2088490A
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US1864364A
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US2259294A
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US2473915A
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US2446202A
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US2372104A
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US2456800A
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US2548474A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |