Patent US3219422A successfully refreshed from Google Patents.
US3219422A
Expired / Lapsed
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Extraction of alkaline earth metal values using liquid ion exchanger
Assignee: Dow Chemical Co
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Filing: 1963-05-01
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Granted: 1965-11-23
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Expires: 1983-05-01
Abstract
No abstract record available.
Inventors
- 👤 David A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:34
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR EXTRACTING ALKALINE EARTH METAL VALUES DISSOLVED IN AN AQUEOUS SOLUTION WHICH COMPRISES; (1) CONTACTING SAID SOSLUTION WITH A SUBSTANTIALLY WATERIMMISCIBLE LIQUID ORGANIC EXTRACTANT FORMED BY THE ADDITION OF A LIQUID WATER-IMMISCIBLE EXCHANGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF (I) ALKYL ARYL SULFONATES, (II) ALKYL SULFATES, (III) ALKYL SULFOSUCCINATES AND (IV) PETROLEUM SULFONATES CORRESPONDING RESPECTIVELY TO THE EMPIRICAL FORMULAE R(M)-AR-(SO3M)X
Claim 2
Dependent Claim
63 words
A PROCESS FOR EXTRACTING ALKALINE EARTH METAL VALUES DISSOLVED IN AN AQUEOUS SOLUTION WHICH COMPRISES; (1) CONTACTING SAID SOSLUTION WITH A SUBSTANTIALLY WATERIMMISCIBLE LIQUID ORGANIC EXTRACTANT FORMED BY THE ADDITION OF A LIQUID WATER-IMMISCIBLE EXCHANGE MATERIAL SELECTED FROM THE GROUP CONSISTING OF (I) ALKYL ARYL SULFONATES, (II) ALKYL SULFATES, (III) ALKYL SULFOSUCCINATES AND (IV) PETROLEUM SULFONATES CORRESPONDING RESPECTIVELY TO THE EMPIRICAL FORMULAE R(M)-AR-(SO3M)X
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |