US3558288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of metal ions from acidic aqueous solution using an amine and a carboxylic acid
Assignee: Ashland LLC
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Filing: 1965-04-15
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Granted: 1971-01-26
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Expires: 1985-04-15
Abstract
Abstract AQUEOUS SOLUTIONS OF A VARIETY OF HEAVY METAL CATIONS, PARTICULARLY EXEMPLARY OF WHICH IS COPPER, ARE EXTRACTED BY CONTACT WITH AN IMMISCIBLE HYDROCARBON HAVING DISSOLVED THEREIN AN AMINE AND A MONOCARBOXYLIC ACID TO PROVIDE A HYDROCARBON PHASE CONTAINING THE EXTRACTED METAL VALUES IN THE FORM OF READILY DECOMPOSABLE COMPLEXES THEREOF.
Inventors
- 👤 Raymond C Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:09
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/026; C01; C01G; C01G3/00; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/402; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |