US2855294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extracting strong acids in an aqueous medium
Assignee: Centre National de la Recherche Scientifique
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Filing: 1954-06-09
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Granted: 1958-10-07
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Expires: 1974-06-09
Abstract
No abstract record available.
Inventors
- 👤 Tribalat Suzanne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492; B01J; B01J19/00; B01J19/0086; C; C01; C01B; C01B11/00; C01B11/16; C01B17/00; C01B17/69; C01B17/74; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C07; C07C; C07C201/00; C07C201/06; C07C201/16; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
THE METHOD OF EXTRACTING RHENIUM FROM MOLYBDENITES CONTAINING RHENIUM DERIVATIVES, WHICH COMPRISES OXIDIZING THE RHENIUM DERIVATIVES TO PERRHENATES, DISSOLVING SAID PERRHENATES IN WATER, ADDING HYDROGEN IONS TO THE AQUOUS SOLUTION IN EXCESS OF THE AMOUNT REQUIRED TO TRANSFORM SAID PERRHENATES INTO PERRHENIC ACID, ADDING A SUBSTANTIALLY WATER-IMMISCIBLE ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF RELATIVELY WATER-INSOLUBLE ALCOHOLS AND KETONES TO SAID ACID SOLUTION, WHEREBY SAID PERRHENIC ACID PASSES FROM THE AQUEOUS PHASE TO THE SOLVENT PHASE, SEPARATING THE SOLVENT PHASE FROM THE AQUEOUS PHASE, EXTRACTING THE PERRHENIC ACID FROM SAID SOLVENT
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |