US1869844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of metal from coated metal foils
Assignee: Alcoa Corp
•
Filing: 1931-12-17
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Granted: 1932-08-02
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Expires: 1951-12-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Derr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:32
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/005; C22B21/00; C22B21/0038; C22B21/0069; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S266/00; 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) | 1935-08-02 | 1936-02-01 | 1936-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-02 | 1940-02-01 | 1940-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-02 | 1944-02-01 | 1944-08-02 | $7700.00 | Window Closed / Lapsed |