US3565608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of gold from solutions
Assignee: Gulf Research and Development Co
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Filing: 1968-11-12
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Granted: 1971-02-23
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Expires: 1988-11-12
Abstract
Abstract A METHOD IS PROVIDED IN WHICH GOLD IS RECOVERED FROM DILUTE AQUEOUS SOLUTIONS THEREOF BY CONTACTING SUCH SOLUTIONS WITH A WATER-INSOLUBLE ETHYLENE POLYMER CONTAINING CARBOXYLATE AND/OR AMIDE GROUPS. THE GOLD BECOMES ASSOCIATED WITH THE CARBOXYLATE AND/OR AMIDE GROUPS OF THE POLYMER AND CAN BE RECOVERED BY BURNING THE POLYMER TO RECOVER AN ASH ENRICHED IN GOLD.
Inventors
- 👤 Harry D Anspon
- 👤 Donald G Ashburn
- 👤 Bert H Clampitt
- 👤 Ronald E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:04
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; 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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |