Patent US1546654A successfully refreshed from Google Patents.
Patent US3380899A successfully refreshed from Google Patents.
US3380899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic preparation and recovery of tetraalkyl lead compounds
Assignee: ChampionX LLC
•
Filing: 1964-10-16
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Granted: 1968-04-30
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Expires: 1984-10-16
Abstract
No abstract record available.
Inventors
- 👤 David G Braithwaite
- 👤 Lawrence L Bott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:32
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/01; C25B3/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCESS FOR PREPARING A WATER INSOLUBLE TETRAALKYL LEAD COMPOUND BY ELECTROLYZING AN ANHYDROUS SOLUTION OF A GRIGNARD REAGENT IN AN ORGANIC SOLVENT, USING A SACRIFICIAL LEAD ANODE, THE IMPROVEMENT WHICH COMPRISES USING AS AT LEAST ONE OF THE SOLVENTS FOR SAID GRIGNARD REAGENT A WATER IMMISCIBLE DIETHER OF A GLYCOL WHICH IS LIQUID UNDER THE CONDITIONS EMPLOYED IN THE PROCESS AND CONTAINS AN ARYL HYDROCARBON GROUP IN AT LEAST ONE OF THE ETHER GROUPS OF SAID DIETHER, MIXING THE RESULTANT ELECTROLYTE, AFTER ELECTROLYSIS, WITH WATER TO FORM AN AQUEOUS PHASE AND AN ORGANIC PHASE, EXTRACTING SAID ORGANIC PHASE WITH A WATER MISCIBLE EXTRACTION SOLVENT OF A TYPE CAPABLE OF EXTRACTING AROMATIC HYDROCARBONS FROM ALIPHATIC HYDROCARBONS, AND RECOVERING SAID TETRAALKYL COMPOUND FROM THE RAFFINATE.
Claim 2
Dependent Claim
125 words
IN A PROCESS FOR PREPARING A WATER INSOLUBLE TETRAALKYL LEAD COMPOUND BY ELECTROLYZING AN ANHYDROUS SOLUTION OF A GRIGNARD REAGENT IN AN ORGANIC SOLVENT, USING A SACRIFICIAL LEAD ANODE, THE IMPROVEMENT WHICH COMPRISES USING AS AT LEAST ONE OF THE SOLVENTS FOR SAID GRIGNARD REAGENT A WATER IMMISCIBLE DIETHER OF A GLYCOL WHICH IS LIQUID UNDER THE CONDITIONS EMPLOYED IN THE PROCESS AND CONTAINS AN ARYL HYDROCARBON GROUP IN AT LEAST ONE OF THE ETHER GROUPS OF SAID DIETHER, MIXING THE RESULTANT ELECTROLYTE, AFTER ELECTROLYSIS, WITH WATER TO FORM AN AQUEOUS PHASE AND AN ORGANIC PHASE, EXTRACTING SAID ORGANIC PHASE WITH A WATER MISCIBLE EXTRACTION SOLVENT OF A TYPE CAPABLE OF EXTRACTING AROMATIC HYDROCARBONS FROM ALIPHATIC HYDROCARBONS, AND RECOVERING SAID TETRAALKYL COMPOUND FROM THE RAFFINATE.
References Cited (Backward Citations)
US3118825A
Cited
US3312605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |