Patent US2965441A successfully refreshed from Google Patents.
US2965441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange for the recovery of chemicals
Assignee: EIDP Inc
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Filing: 1956-11-29
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Granted: 1960-12-20
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Expires: 1976-11-29
Abstract
No abstract record available.
Inventors
- 👤 Welton Donald Eldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:15
CPC Classifications
B; B01; B01J; B01J41/00; C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS FOR THE RECOVERY OF COPPER FROM THE FILTRATE BRINE OF A DICYANOBUTENE SYNTHESIS, THE STEPS WHICH WHICH COMPRISE ACIDIFYING A CUPROCYANIDE ION CONTAINING BRINE OF THE DICYANOBUTENE SYNTHESIS WITH AN INORGANIC ACID TO A PH BELOW ABOUT 2.5 BUT WITHIN A PH SUFFICIENTLY HIGH TO LEAVE NO MORE THAN ABOUT 150 P.P.M. OF COPPER IN THE EFFLUENT FROM THE ION EXCHANGE, PASSING THE ACIDIFIED BRINE THROUGH AN ANION EXCHANGE RESIN, SEPARATING THE ABSORBED COPPER FROM THE RESIN BY ELUTION WITH AN AQUEOUS ALKALI METAL CYANIDE SOLUTION, DISPLACING THE CYANIDE ION ON THE RESIN WITH A CHLORIDE ION FROM AN AQUEOUS BRINE AND WHEN THE CYANIDE HAS BEEN ELUTED FROM THE RESIN REPEATING THE STEPS.
Claim 2
Dependent Claim
117 words
IN A PROCESS FOR THE RECOVERY OF COPPER FROM THE FILTRATE BRINE OF A DICYANOBUTENE SYNTHESIS, THE STEPS WHICH WHICH COMPRISE ACIDIFYING A CUPROCYANIDE ION CONTAINING BRINE OF THE DICYANOBUTENE SYNTHESIS WITH AN INORGANIC ACID TO A PH BELOW ABOUT 2.5 BUT WITHIN A PH SUFFICIENTLY HIGH TO LEAVE NO MORE THAN ABOUT 150 P.P.M. OF COPPER IN THE EFFLUENT FROM THE ION EXCHANGE, PASSING THE ACIDIFIED BRINE THROUGH AN ANION EXCHANGE RESIN, SEPARATING THE ABSORBED COPPER FROM THE RESIN BY ELUTION WITH AN AQUEOUS ALKALI METAL CYANIDE SOLUTION, DISPLACING THE CYANIDE ION ON THE RESIN WITH A CHLORIDE ION FROM AN AQUEOUS BRINE AND WHEN THE CYANIDE HAS BEEN ELUTED FROM THE RESIN REPEATING THE STEPS.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |