Patent US2834669A successfully refreshed from Google Patents.
US2834669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for direct extraction of a metal from its sulphide
Assignee: Sesam SA
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Filing: 1954-04-09
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Granted: 1958-05-13
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Pendar Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:04
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF EXTRACTING A METAL FROM ITS SULFIDE, COMPRISING THE STEPS OF MELTING LEAD SULFIDE IN THE PRESENCE OF SODIUM CARBONATE, AN OXIDE SELECTED FROM THE GROUP CONSISTING OF ZINC OXIDE, IRON OXIDE, SILICA AND LIME, SODIUM CHLORIDE, AND CARBON, THEREBY CAUSING REDUCTION OF SAID LEAD SULFIDE TO THE CORRESPONDING LEAD, AND RECOVERING THE THUS FORMED FREE LEAD.
Claim 2
Independent Claim
59 words
A METHOD OF EXTRACTING A METAL FROM ITS SULFIDE, COMPRISING THE STEPS OF MELTING LEAD SULFIDE IN THE PRESENCE OF SODIUM CARBONATE, AN OXIDE SELECTED FROM THE GROUP CONSISTING OF ZINC OXIDE, IRON OXIDE, SILICA AND LIME, SODIUM CHLORIDE, AND CARBON, THEREBY CAUSING REDUCTION OF SAID LEAD SULFIDE TO THE CORRESPONDING LEAD, AND RECOVERING THE THUS FORMED FREE LEAD.
References Cited (Backward Citations)
US821330A
Cited
US2343761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |