US2777866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tetraalkyl-lead compounds
Assignee: Ethyl Corp
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Filing: 1953-08-17
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Granted: 1957-01-15
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Expires: 1973-08-17
Abstract
No abstract record available.
Inventors
- 👤 Sidney M Blitzer
- 👤 Orland M Brown
- 👤 William B Grandjean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:56
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE IMPROVED PROCESS OF SEPARATING TETRAETHYLLEAD AND THE SOLIDS OF A REACTION MIXTURE, SAID SOLIDS INCLUDING FINELY DIVIDED LEAD, ALKALI METAL CHLORIDE, AND MINOR QUANTITIES OF ALKALINE REACTING COMPONENTS, COMPRISING FORMING A SLURRY OF THE REACTION MIXTURE WITH ETHYL CHLORIDE AND DISSOLVING THE TETRAETHYLLEAD THEREIN, THE ETHYL CHLORIDE BEING PROVIDED IN THE PROPORTIONS OF AT LEAST TWO PARTS BY WEIGHT TO ONE PART OF THE SUM OF THE WEIGHTS OF THE TETRAETHYLLEAD AND THE SOLIDS, INTIMATELY MIXING THE SO-FORMED SLURRY WITH AN AQUEOUS DILUTE ACID SOLUTON IN PROPORTIONS OF AT LEAST ONE PART OF VOLUME OF SOLUTION TO FOUR PARTS BY VOLUME OF THE SLURRY, AND PROVIDING ACID IN EXCESS OF QUANTITY REQUIRED TO NEUTRALIZE THE ALKALINE REACTING COMPONENTS, THEN MAINTAINING THE MIXTURE AT AND STRATIFY THE LIQUIDS, THE SOLUTION OF TETRAETHYLLEAD BEING FLOATED ON THE AQUEOUS SOLUTION.
Claim 2
Dependent Claim
138 words
THE IMPROVED PROCESS OF SEPARATING TETRAETHYLLEAD AND THE SOLIDS OF A REACTION MIXTURE, SAID SOLIDS INCLUDING FINELY DIVIDED LEAD, ALKALI METAL CHLORIDE, AND MINOR QUANTITIES OF ALKALINE REACTING COMPONENTS, COMPRISING FORMING A SLURRY OF THE REACTION MIXTURE WITH ETHYL CHLORIDE AND DISSOLVING THE TETRAETHYLLEAD THEREIN, THE ETHYL CHLORIDE BEING PROVIDED IN THE PROPORTIONS OF AT LEAST TWO PARTS BY WEIGHT TO ONE PART OF THE SUM OF THE WEIGHTS OF THE TETRAETHYLLEAD AND THE SOLIDS, INTIMATELY MIXING THE SO-FORMED SLURRY WITH AN AQUEOUS DILUTE ACID SOLUTON IN PROPORTIONS OF AT LEAST ONE PART OF VOLUME OF SOLUTION TO FOUR PARTS BY VOLUME OF THE SLURRY, AND PROVIDING ACID IN EXCESS OF QUANTITY REQUIRED TO NEUTRALIZE THE ALKALINE REACTING COMPONENTS, THEN MAINTAINING THE MIXTURE AT AND STRATIFY THE LIQUIDS, THE SOLUTION OF TETRAETHYLLEAD BEING FLOATED ON THE AQUEOUS SOLUTION.
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) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |