Patent US1980263A successfully refreshed from Google Patents.
US1980263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of smelting aluminum
Assignee: National Smelting Co Ltd
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Filing: 1930-05-27
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Granted: 1934-11-13
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Expires: 1950-05-27
Abstract
No abstract record available.
Inventors
- 👤 John G G Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:28
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/0038; C22B21/0069; C22B1/00; C22B1/02; C22B1/08; C22B21/0046; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1937-11-12 | 1938-05-14 | 1938-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-12 | 1942-05-14 | 1942-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-12 | 1946-05-14 | 1946-11-13 | $7700.00 | Window Closed / Lapsed |