Patent US2504840A successfully refreshed from Google Patents.
US2504840A
Expired / Lapsed
US
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Tilting induction furnace
Assignee: Allis Chalmers Corp
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Filing: 1945-05-31
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Granted: 1950-04-18
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Expires: 1965-05-31
Abstract
No abstract record available.
Inventors
- 👤 Lauren L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:45
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)
US1456851A
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US1608801A
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US1777663A
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US1689369A
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US1821530A
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FR657150A
Cited
US1884637A
Cited
DE661097C
Cited
FR827224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |