Patent JPS5494590A successfully refreshed from Google Patents.
Patent US2839389A successfully refreshed from Google Patents.
US2839389A
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Recovery of gold from aqueous cyanide solution
Assignee: National Research Development Corp UK
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Filing: 1956-05-04
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Granted: 1958-06-17
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Expires: 1976-05-04
Abstract
No abstract record available.
Inventors
- 👤 Kember Norman Frank
- 👤 Aveston John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD OF RECOVERING GOLD FROM GOLD-BEARING AQUEOUS CYANIDE LIQUOR CONTAINING THE COMPLEX CYANIDE OF A BASE METAL OF THE CLASS CONSISTING OF COPPER, IRON AND NICKEL, COMPRISING TREATING THE LIQUOR WITH A CROSSLINKED POLYSTYRENE ANION EXCHANGE RESIN WHICH IS PREDOMINANTLY WEAKLY BASIC IN CHARACTER BUT CONTAINS FROM 6% TO 10% OF STRONGLY BASIC QUATERNARY AMMONIUM GROUPS, AND TREATING THE RESIN AND ADSORBED GOLD WITH AN ELUTING AGENT TO RECOVER GOLD FROM THE RESIN.
Claim 2
Independent Claim
74 words
A METHOD OF RECOVERING GOLD FROM GOLD-BEARING AQUEOUS CYANIDE LIQUOR CONTAINING THE COMPLEX CYANIDE OF A BASE METAL OF THE CLASS CONSISTING OF COPPER, IRON AND NICKEL, COMPRISING TREATING THE LIQUOR WITH A CROSSLINKED POLYSTYRENE ANION EXCHANGE RESIN WHICH IS PREDOMINANTLY WEAKLY BASIC IN CHARACTER BUT CONTAINS FROM 6% TO 10% OF STRONGLY BASIC QUATERNARY AMMONIUM GROUPS, AND TREATING THE RESIN AND ADSORBED GOLD WITH AN ELUTING AGENT TO RECOVER GOLD FROM THE RESIN.
References Cited (Backward Citations)
US2259169A
Cited
US2304637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |