Patent US3188199A successfully refreshed from Google Patents.
US3188199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering lead from by-product lead materials
Assignee: EIDP Inc
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Filing: 1962-06-25
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Granted: 1965-06-08
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Mattison
- 👤 Wolfe Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:10
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/02; C22B13/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE PROCESS RECOVERING LEAD FROM BY-PRODUCT LEAD OF THE CHARACTER OF THAT OBTAINED BY THE REACTION OF AN ALKYL CHLORIDE WITH LEAD MONOSODIUM ALLOY WHICH COMPRISES (A) MIXING BY-PRODUCT LEAD WHICH CONSISTS ESSENTIALLY OF ABOUT 76% TO ABOUT 89% BY WEIGHT OF FINELY DIVIDED METALLIC LEAD, ABOUT 9% TO ABOUT 19% BY 20% WEIGHT OF WATER, UP TO 0.05% BY WEIGHT OF SODIUM HYDROXIDE, AND SMALL AMOUNTS UP TO ABOUT 2% BY WEIGHT OF LEAD OXIDE AND LEAD SULFIDE, (B) WITH 0.4% TO ABOUT 1.2% BY WEIGHT OF SODIUM HYDROXIDE BASED ON THE METALLIC LEAD, (C) DRYING THE MIXTURE BY HEATING IT AT ABOUT 100*C. TO ABOUT 160*C. WITH AGITATION UNTIL THE WATER CONTENT IS REDUCED TO ABOUT 1% TO ABOUT 6% BY WEIGHT, (D) HEATING THE DRIED MIXTURE IN A REVERBERATORY FURNACE AT A TEMPERATURE OF FROM ABOUT 650*C. TO ABOUT 1200*C. UNTIL THE METALLIC LEAD IS MOLTEN, AND (E) SEPARATING THE MOLTEN LEAD FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
159 words
THE PROCESS RECOVERING LEAD FROM BY-PRODUCT LEAD OF THE CHARACTER OF THAT OBTAINED BY THE REACTION OF AN ALKYL CHLORIDE WITH LEAD MONOSODIUM ALLOY WHICH COMPRISES (A) MIXING BY-PRODUCT LEAD WHICH CONSISTS ESSENTIALLY OF ABOUT 76% TO ABOUT 89% BY WEIGHT OF FINELY DIVIDED METALLIC LEAD, ABOUT 9% TO ABOUT 19% BY 20% WEIGHT OF WATER, UP TO 0.05% BY WEIGHT OF SODIUM HYDROXIDE, AND SMALL AMOUNTS UP TO ABOUT 2% BY WEIGHT OF LEAD OXIDE AND LEAD SULFIDE, (B) WITH 0.4% TO ABOUT 1.2% BY WEIGHT OF SODIUM HYDROXIDE BASED ON THE METALLIC LEAD, (C) DRYING THE MIXTURE BY HEATING IT AT ABOUT 100*C. TO ABOUT 160*C. WITH AGITATION UNTIL THE WATER CONTENT IS REDUCED TO ABOUT 1% TO ABOUT 6% BY WEIGHT, (D) HEATING THE DRIED MIXTURE IN A REVERBERATORY FURNACE AT A TEMPERATURE OF FROM ABOUT 650*C. TO ABOUT 1200*C. UNTIL THE METALLIC LEAD IS MOLTEN, AND (E) SEPARATING THE MOLTEN 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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |