Patent US2845330A successfully refreshed from Google Patents.
US2845330A
Expired / Lapsed
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Method of recovering cyanides from waste aqueous solutions containing metal cyanides
Assignee: Individual
•
Filing: 1955-08-15
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Granted: 1958-07-29
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Expires: 1975-08-15
Abstract
No abstract record available.
Inventors
- 👤 Zabban Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/02; C01C3/0262; C01C3/0287; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE METHOD OF RECOVERING CYANIDES FROM WASTE AQUEOUS SOLUTION CONTAINING METAL CYANIDES, COMPRISING ADDING COPPER SULFATE AND SODIUM SULFITE, MAINTAINING A PH OF BETWEEN 6.5 AND 7.5 TO PRECIPITATE THE CYANIDE COMPOUNDS, THE PRECIPITATE CONSISTING PRINCIPALLY OF CUPROUS CYANIDE, AND THEN SEPARATING THE PRECIPITATE FROM THE SOLUTION.
Claim 2
Independent Claim
47 words
THE METHOD OF RECOVERING CYANIDES FROM WASTE AQUEOUS SOLUTION CONTAINING METAL CYANIDES, COMPRISING ADDING COPPER SULFATE AND SODIUM SULFITE, MAINTAINING A PH OF BETWEEN 6.5 AND 7.5 TO PRECIPITATE THE CYANIDE COMPOUNDS, THE PRECIPITATE CONSISTING PRINCIPALLY OF CUPROUS CYANIDE, AND THEN SEPARATING THE PRECIPITATE FROM THE SOLUTION.
References Cited (Backward Citations)
US2049358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |