Patent US3387928A successfully refreshed from Google Patents.
US3387928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tellurium and/or selenium from aqueous solutions
Assignee: Dow Chemical Co
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Filing: 1965-04-08
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Granted: 1968-06-11
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Expires: 1985-04-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Doumas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:08
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF RECOVERING METAL VALUES SELECTED FROM THE CLASS CONSISTING OF TELLURIUM-CONTAINING MATERIAL, SELENIUM-CONTAINING MATERIAL, AND MIXTURES THEREOF WHICH COMPRISES PREPARING AN ACIDIC SOLUTION OF SAID MATERIAL BY DISSOLVING IT IN AN AQUEOUS ACID SELECTED FROM THE CLASS CONSISTING OF HYDROCHLORIC, PHOSPHORIC, AND MIXTURES THEREOF TO MAKE AN AQUEOUS ACIDIC SOLUTION OF SAID MATERIAL HAVING A PH VALUE OF 6 OR LESS; ADMIXING WITH THE SOLUTION SO MADE A 2-HYDROXYETHYL-N-ALKYL ETHER, HAVING FROM 5 TO ABOUT 10 CARBON ATOMS IN THE ALKYL, IN AN AMOUNT SUFFICIENT TO PROVIDE PROPORTIONS BY VOLUME OF BETWEEN FROM ABOUT 10 TO 1 OF THE METAL-CONTAINING ACIDIC SOLUTION AND FROM ABOUT 1 TO 10 OF THE 2-HYDROXYETHYLN-ALKYL ETHER; ALLOWING THE RESULTING SOLUTION TO STAND TO EFFECTUATE A SEPARATION INTO AN UPPER ORGANIC PHASE CONTAINING A PREPONDERANCE OF THE TELLURIUM AND SELENIUM VALUES AND A LOWER AQUEOUS PHASE; AND SEPARATING THE TWO PHASES.
Claim 2
Independent Claim
148 words
THE METHOD OF RECOVERING METAL VALUES SELECTED FROM THE CLASS CONSISTING OF TELLURIUM-CONTAINING MATERIAL, SELENIUM-CONTAINING MATERIAL, AND MIXTURES THEREOF WHICH COMPRISES PREPARING AN ACIDIC SOLUTION OF SAID MATERIAL BY DISSOLVING IT IN AN AQUEOUS ACID SELECTED FROM THE CLASS CONSISTING OF HYDROCHLORIC, PHOSPHORIC, AND MIXTURES THEREOF TO MAKE AN AQUEOUS ACIDIC SOLUTION OF SAID MATERIAL HAVING A PH VALUE OF 6 OR LESS; ADMIXING WITH THE SOLUTION SO MADE A 2-HYDROXYETHYL-N-ALKYL ETHER, HAVING FROM 5 TO ABOUT 10 CARBON ATOMS IN THE ALKYL, IN AN AMOUNT SUFFICIENT TO PROVIDE PROPORTIONS BY VOLUME OF BETWEEN FROM ABOUT 10 TO 1 OF THE METAL-CONTAINING ACIDIC SOLUTION AND FROM ABOUT 1 TO 10 OF THE 2-HYDROXYETHYLN-ALKYL ETHER; ALLOWING THE RESULTING SOLUTION TO STAND TO EFFECTUATE A SEPARATION INTO AN UPPER ORGANIC PHASE CONTAINING A PREPONDERANCE OF THE TELLURIUM AND SELENIUM VALUES AND A LOWER AQUEOUS PHASE; AND SEPARATING THE TWO PHASES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |