Patent US1402732A successfully refreshed from Google Patents.
US1402732A
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US
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Recovery of lead and silver from sulphide ores and metallurgical products
Assignee: AMALGAMATED ZINC (DE BAVAY'S) Ltd
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Filing: 1920-04-15
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Granted: 1922-01-10
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Expires: 1940-04-15
Abstract
No abstract record available.
Inventors
- 👤 Avery David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:10
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/06; C22B3/10; 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) | 1925-01-09 | 1925-07-11 | 1926-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-01-09 | 1929-07-11 | 1930-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-01-09 | 1933-07-11 | 1934-01-10 | $7700.00 | Window Closed / Lapsed |