US3664815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of organic solvents containing metals by peroxide wash
Assignee: Glencore Canada Corp
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Filing: 1969-12-12
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Granted: 1972-05-23
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Expires: 1989-12-12
Abstract
Abstract A METHOD FOR THE REMOVAL OF RESIDUAL METALS, SUCH AS COPPER, FROM FOULED ORGANIC SOLVENTS, SUCH AS AMINES, WHICH ARE USED IN SOLVENT EXTRACTION PROCESSES, IN WHICH THE METAL-CONTAINING AMINE IS CONTACTED WITH AN AQUEOUS STRIPPING CONTAINING DILUTE CONCENTRATIONS OF A SOLUBLE PEROXIDE.
Inventors
- 👤 Eivind Wigstol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:29
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492; C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/282; 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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |