Patent US2928306A successfully refreshed from Google Patents.
Patent US3055754A successfully refreshed from Google Patents.
US3055754A
Expired / Lapsed
US
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Extraction of metal values
Assignee: National Research Development Corp UK
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Filing: 1960-06-24
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Granted: 1962-09-25
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Expires: 1980-06-24
Abstract
No abstract record available.
Inventors
- 👤 Fletcher Archibald William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/32; C22B3/324; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR EXTRACTING METAL VALUES SELECTED FROM THE GROUP CONSISTING OF BIVALENT METAL VALUES, FERRIC IRON VALUES AND ALUMINUM VALUES FROM AN AQUEOUS MEDIUM CONTAINING AT LEAST ONE METAL VALUE SELECTED FROM THE GROUP CONSISTING OF BIVALENT METAL VALUES, FERRIC IRON VALUES AND ALUMINUM VALUES, WHICH COMPRISES CONTACTING SAID AQUEOUS MEDIUM WITH A SOLUTION OF NAPHTHENIC ACID IN AN INERT SOLVENT WHICH IS SUBSTANTIALLY IMMISCIBLE WITH THE AQUEOUS MEDIUM, SAID AQUEOUS MEDIUM BEING AT A PH WHICH IS NOT MORE THAN 0.5 OF A PH UNIT BELOW THE PH OF HYDROLYSIS OF THE METAL VALUE WHICH IT IS DESIRED TO EXTRACT.
Claim 2
Dependent Claim
102 words
A PROCESS FOR EXTRACTING METAL VALUES SELECTED FROM THE GROUP CONSISTING OF BIVALENT METAL VALUES, FERRIC IRON VALUES AND ALUMINUM VALUES FROM AN AQUEOUS MEDIUM CONTAINING AT LEAST ONE METAL VALUE SELECTED FROM THE GROUP CONSISTING OF BIVALENT METAL VALUES, FERRIC IRON VALUES AND ALUMINUM VALUES, WHICH COMPRISES CONTACTING SAID AQUEOUS MEDIUM WITH A SOLUTION OF NAPHTHENIC ACID IN AN INERT SOLVENT WHICH IS SUBSTANTIALLY IMMISCIBLE WITH THE AQUEOUS MEDIUM, SAID AQUEOUS MEDIUM BEING AT A PH WHICH IS NOT MORE THAN 0.5 OF A PH UNIT BELOW THE PH OF HYDROLYSIS OF THE METAL VALUE WHICH IT IS DESIRED TO EXTRACT.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |