US2797158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing lead from lead sulfide containing materials
Assignee: GEA Group AG
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Filing: 1954-09-10
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Granted: 1957-06-25
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Expires: 1974-09-10
Abstract
No abstract record available.
Inventors
- 👤 Wendeborn Helmut
- 👤 Schwartz Werner
- 👤 Rausch Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:47
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE PRODUCTION OF METALLIC LEAD FROM MATERIALS CONTAINING LEAD SULFIDE WITH A CONTENT OF AT LEAST 50% PB WHICH COMPRISES SINTERING SAID LEAD SULFIDE CONTAINING MATERIAL WITHOUT ADDITION OF FUEL IN ADMIXTURE WITH AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF FLY ASH AND RECYCLED SINTERED MATERIAL UNDER OXIDIZING ROASTING CONDITIONS TO PROVIDE ABOUT A SUFFICIENT QUANTITY OF OXYGEN BOUND TO LEAD IN THE SINTERED PRODUCT TO REACT UPON HEATING WITH THE SULFUR BOUND TO LEAD RETAINED IN THE SINTERED PRODUCT, AND HEATING A CHARGE OF THE SINTERED PRODUCT WITHOUT ADDITION OF FUEL TO REACTION TEMPERATURES TO PRODUCE METALLIC LEAD AND VOLATILE SULFUR COMPOUNDS.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE PRODUCTION OF METALLIC LEAD FROM MATERIALS CONTAINING LEAD SULFIDE WITH A CONTENT OF AT LEAST 50% PB WHICH COMPRISES SINTERING SAID LEAD SULFIDE CONTAINING MATERIAL WITHOUT ADDITION OF FUEL IN ADMIXTURE WITH AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF FLY ASH AND RECYCLED SINTERED MATERIAL UNDER OXIDIZING ROASTING CONDITIONS TO PROVIDE ABOUT A SUFFICIENT QUANTITY OF OXYGEN BOUND TO LEAD IN THE SINTERED PRODUCT TO REACT UPON HEATING WITH THE SULFUR BOUND TO LEAD RETAINED IN THE SINTERED PRODUCT, AND HEATING A CHARGE OF THE SINTERED PRODUCT WITHOUT ADDITION OF FUEL TO REACTION TEMPERATURES TO PRODUCE METALLIC LEAD AND VOLATILE SULFUR COMPOUNDS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |