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US1797276A
Expired / Lapsed
US
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Metal-recovering furnace
Assignee: Alcoa Corp
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Filing: 1926-06-25
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Granted: 1931-03-24
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Expires: 1946-06-25
Abstract
No abstract record available.
Inventors
- 👤 Theron D Stay
- 👤 Harrison O Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:13
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/20; F27B17/00; Y; Y10; Y10S; Y10S266/00; Y10S266/90; Y10S266/901
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) | 1934-03-23 | 1934-09-22 | 1935-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-03-23 | 1938-09-22 | 1939-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-03-23 | 1942-09-22 | 1943-03-24 | $7700.00 | Window Closed / Lapsed |