US1879360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric induction furnace
Assignee: Ajax Electrothermic Corp
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Filing: 1929-07-22
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Granted: 1932-09-27
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Expires: 1949-07-22
Abstract
No abstract record available.
Inventors
- 👤 Linnhoff Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:34
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24
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) | 1935-09-27 | 1936-03-28 | 1936-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-09-27 | 1940-03-28 | 1940-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-09-27 | 1944-03-28 | 1944-09-27 | $7700.00 | Window Closed / Lapsed |