US3052535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovering lead from by-product lead materials
Assignee: EIDP Inc
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Filing: 1960-09-20
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Granted: 1962-09-04
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Expires: 1980-09-20
Abstract
No abstract record available.
Inventors
- 👤 Peters John Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:13
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE PROCESS FOR RECOVERING METALLIC LEAD FROM A BYPRODUCT LEAD MATERIAL WHICH CONTAINS LEAD COMPOUNDS AND WHICH IS OF THE CHARACTER OF THOSE OBTAINED IN THE MANUFACTURE OF TETRAETHYLLEAD, WHICH PROCESS COMPRISES HEATING SAID BY-PRODUCT LEAD MATERIAL AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 600*C. TO ABOUT 750*C. IN THE PRESENCE OF CARBON IN A PROPORTION CORRESPONDING TO AT LEAST ABOUT 25% EXCESS OVER THAT THEORETICALLY REQUIRED TO REACT WITH THE LEAD COMPOUNDS AND CONVERT THEM TO METALLIC LEAD, AND FROM ABOUT 0.25% TO ABOUT 30% BY WEIGHT OF THE BY-PRODUCT LEAD MATERIAL OF A FLUX WHICH CONSISTS ESSENTIALLY OF FROM ABOUT 3% TO ABOUT 40% BY WEIGHT OF THE BY-PRODUCT LEAD MATERIAL OF A FLUX WHICH 60% BY WEIGHT OF A MIXTURE OF POTASSIUM CARBONATE AND SODIUM CARBONATE IN WHICH THE POTASSIUM CARBONATE CONSTITUTES FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF THE MIXTURE OF CARBONATES, THE TEMPERATURE BEING SUFFICIENT TO MAINTAIN SAID FLUX IN A MOLTEN STATE, AND SEPARATING MOLTEN METALLIC LEAD FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
171 words
THE PROCESS FOR RECOVERING METALLIC LEAD FROM A BYPRODUCT LEAD MATERIAL WHICH CONTAINS LEAD COMPOUNDS AND WHICH IS OF THE CHARACTER OF THOSE OBTAINED IN THE MANUFACTURE OF TETRAETHYLLEAD, WHICH PROCESS COMPRISES HEATING SAID BY-PRODUCT LEAD MATERIAL AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 600*C. TO ABOUT 750*C. IN THE PRESENCE OF CARBON IN A PROPORTION CORRESPONDING TO AT LEAST ABOUT 25% EXCESS OVER THAT THEORETICALLY REQUIRED TO REACT WITH THE LEAD COMPOUNDS AND CONVERT THEM TO METALLIC LEAD, AND FROM ABOUT 0.25% TO ABOUT 30% BY WEIGHT OF THE BY-PRODUCT LEAD MATERIAL OF A FLUX WHICH CONSISTS ESSENTIALLY OF FROM ABOUT 3% TO ABOUT 40% BY WEIGHT OF THE BY-PRODUCT LEAD MATERIAL OF A FLUX WHICH 60% BY WEIGHT OF A MIXTURE OF POTASSIUM CARBONATE AND SODIUM CARBONATE IN WHICH THE POTASSIUM CARBONATE CONSTITUTES FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF THE MIXTURE OF CARBONATES, THE TEMPERATURE BEING SUFFICIENT TO MAINTAIN SAID FLUX IN A MOLTEN STATE, AND SEPARATING MOLTEN METALLIC LEAD FROM THE REACTION MIXTURE.
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) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |