Patent JPS5548009A successfully refreshed from Google Patents.
Patent US3573182A successfully refreshed from Google Patents.
US3573182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating zinc and copper
Assignee: United States Department of the Interior
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Filing: 1968-01-11
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Granted: 1971-03-30
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Expires: 1988-01-11
Abstract
Abstract ZINC IS PREFERENTIALLY EXTRACTED FROM SOLUTIONS CONTAINING COPPER AND ZINC IONS USING A CALCIUM SALT OF AN ORGANIC HYDROGEN PHOSPHATE. A COMPLETE PROCESS INCLUDING THE SELECTIVE EXTRACTION AND THE RECOVERY OF ZINC AND COPPER FROM THE ORGANIC AND AQUEOUS PHASES RESPECTIVELY IS DESCRIBED.
Inventors
- 👤 Philip E Churchward
- 👤 Samuel Ralph Borrowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/3846; 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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |