US3244475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction process for separating rhenium from molybdenum
Assignee: Individual
•
Filing: 1962-10-31
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Granted: 1966-04-05
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Expires: 1982-10-31
Abstract
No abstract record available.
Inventors
- 👤 Philip E Churchward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
C; C01; C01G; C01G47/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A PROCESS FOR SEPARATING RHENIUM FROM MOLYBDENUM IN AN AQUEOUS SOLUTION CONTAINING, IN AN AQUEOUS SOLVENT, RHENIUM IN ITS HEPTAVALENT STATE AND MOLYBDENUM IN ITS HEXAVALENT STATE COMPRISING ADJUSTING SAID SOLUTION TO A PH OF FROM 8 TO 12, SUBSEQUENTLY CONTACTING THE SOLUTION WITH AN ORGANIC EXTRACTANT CONTAIING, IN AN ORGANIC CARRIER SOLVENT, A QUATERNARY AMMONIUM COMPOUND HAVING THE FORMULA R3(CH3)NCL, IN WHICH R IS A SATURATED STRAIGHT-CHAIN ALKYL RADICAL OF FROM 8 TO 10 CARBON ATOMS, SAID ORGANIC CARRIER SOLVENT AND SAID AQUEOUS SOLVENT BEING RELATIVELY IMMISCIBLE LIQUIDS, WHEREBY SAID CONTACTING STEP RESULTS IN THE FORMATION OF SEPARABLE AQUEOUS AND ORGANIC PHASES, SAID ORGANIC CARRIER SOLVENT, WITH RESPECT TO SAID AQUEOUS SOLVENT, CAPABLE OF PREFERENTIALLY DISSOLVING RHENIUM-QUATERNARY AMMONIUM COMPOUNDS THAT FORM AS A RESULT OF SAID CONTACTING STEP, WHEREBY SAID CONTACTING STEP RESULTS IN THE RHENIUM VALUES IN SAID AQUEOUS SOLUTION BEING TRANSFERRED TO SAID ORGANIC PHASE WITH SAID MOLYBDENUM REMAINING IN SAID AQUEOUS PHASE, AND SEPARATING SAID ORGANIC AND AQUEOUS PHASES FROM ONE ANOTHER.
Claim 2
Dependent Claim
166 words
A PROCESS FOR SEPARATING RHENIUM FROM MOLYBDENUM IN AN AQUEOUS SOLUTION CONTAINING, IN AN AQUEOUS SOLVENT, RHENIUM IN ITS HEPTAVALENT STATE AND MOLYBDENUM IN ITS HEXAVALENT STATE COMPRISING ADJUSTING SAID SOLUTION TO A PH OF FROM 8 TO 12, SUBSEQUENTLY CONTACTING THE SOLUTION WITH AN ORGANIC EXTRACTANT CONTAIING, IN AN ORGANIC CARRIER SOLVENT, A QUATERNARY AMMONIUM COMPOUND HAVING THE FORMULA R3(CH3)NCL, IN WHICH R IS A SATURATED STRAIGHT-CHAIN ALKYL RADICAL OF FROM 8 TO 10 CARBON ATOMS, SAID ORGANIC CARRIER SOLVENT AND SAID AQUEOUS SOLVENT BEING RELATIVELY IMMISCIBLE LIQUIDS, WHEREBY SAID CONTACTING STEP RESULTS IN THE FORMATION OF SEPARABLE AQUEOUS AND ORGANIC PHASES, SAID ORGANIC CARRIER SOLVENT, WITH RESPECT TO SAID AQUEOUS SOLVENT, CAPABLE OF PREFERENTIALLY DISSOLVING RHENIUM-QUATERNARY AMMONIUM COMPOUNDS THAT FORM AS A RESULT OF SAID CONTACTING STEP, WHEREBY SAID CONTACTING STEP RESULTS IN THE RHENIUM VALUES IN SAID AQUEOUS SOLUTION BEING TRANSFERRED TO SAID ORGANIC PHASE WITH SAID MOLYBDENUM REMAINING IN SAID AQUEOUS PHASE, AND SEPARATING SAID ORGANIC AND AQUEOUS PHASES FROM ONE ANOTHER.
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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |