Patent US2477443A successfully refreshed from Google Patents.
US2477443A
Expired / Lapsed
US
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Activated zinc dust for gold and silver precipitation
Assignee: Hudbay Minerals Inc
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Filing: 1947-06-20
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Granted: 1949-07-26
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Expires: 1967-06-20
Abstract
No abstract record available.
Inventors
- 👤 Dwight J A Dahlgren
- 👤 Luther G Hendrickson
- 👤 Griffith Dinsmore Laurence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:00
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA322278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |