Patent US1434485A successfully refreshed from Google Patents.
US1434485A
Expired / Lapsed
US
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Process of recovering metals
Assignee: B F Drakenfeld & Co Inc
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Filing: 1919-11-07
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Granted: 1922-11-07
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Expires: 1939-11-07
Abstract
No abstract record available.
Inventors
- 👤 D Adrian Alexander L Duval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:24
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/08
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) | 1925-11-06 | 1926-05-08 | 1926-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-11-06 | 1930-05-08 | 1930-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-11-06 | 1934-05-08 | 1934-11-07 | $7700.00 | Window Closed / Lapsed |