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US2795409A
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US
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Open hearth apparatus
Assignee: Siemens Industry Inc
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Filing: 1954-07-14
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Granted: 1957-06-11
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Expires: 1974-07-14
Abstract
No abstract record available.
Inventors
- 👤 Henry S Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:16
CPC Classifications
F; F27; F27B; F27B3/00; F28; F28D; F28D17/00; F28D17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |