US2863731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of the state of the selenium in alkali slags
Assignee: American Smelting and Refining Co
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Filing: 1952-12-20
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Granted: 1958-12-09
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Expires: 1972-12-20
Abstract
No abstract record available.
Inventors
- 👤 Carroll B Porter
- 👤 Jr Armand L Labbe
- 👤 Kenneth N Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:25
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/008; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR RECOVERING SELENIUM VALUES FROM A SELENIUM-CONTAINING MATERIAL WHICH COMPRISES FUSING SAID MATERIAL WITH AN ALKALINE COMPOUND OF AN ALKALI METAL TO OBTAIN A MOLTEN-SELENIUM-CONTAINING SLAG, OXIDIZING THE MOLTEN SLAG WITH A SUFFICIENT AMOUNT OF AN OXIDIZING AGENT TO FORM A YELLOW TO A YELLOW-SH-GREEN COLORED SLAG AS DETERNINED BY A SOLIDIFIED SLAG SAMPLE, THEREAFTER INTRODUCING A SUFFICIENT AMOUNT OF A REDUCING AGENT INTO THE YELLOW COLORED SLAG TO FORM A BLUISH-GRAY COLORED SLAG AS DETERMINED BY A SOLIDIFIED SLAG SAMPLE, THEREBY INSURING THE CONVERSION OF SUBSTANTIALLY ALL OF THE SELENIUM VALUES IN THE SLAG TO THE ALKALI METAL SELENITE STATE, LEACHING THE BLUISH-GRAY COLORED SLAG, AND RECOVERING SELENIUM VALUES FROM THE LEACH SOLUTION.
Claim 2
Dependent Claim
116 words
A PROCESS FOR RECOVERING SELENIUM VALUES FROM A SELENIUM-CONTAINING MATERIAL WHICH COMPRISES FUSING SAID MATERIAL WITH AN ALKALINE COMPOUND OF AN ALKALI METAL TO OBTAIN A MOLTEN-SELENIUM-CONTAINING SLAG, OXIDIZING THE MOLTEN SLAG WITH A SUFFICIENT AMOUNT OF AN OXIDIZING AGENT TO FORM A YELLOW TO A YELLOW-SH-GREEN COLORED SLAG AS DETERNINED BY A SOLIDIFIED SLAG SAMPLE, THEREAFTER INTRODUCING A SUFFICIENT AMOUNT OF A REDUCING AGENT INTO THE YELLOW COLORED SLAG TO FORM A BLUISH-GRAY COLORED SLAG AS DETERMINED BY A SOLIDIFIED SLAG SAMPLE, THEREBY INSURING THE CONVERSION OF SUBSTANTIALLY ALL OF THE SELENIUM VALUES IN THE SLAG TO THE ALKALI METAL SELENITE STATE, LEACHING THE BLUISH-GRAY COLORED SLAG, AND RECOVERING SELENIUM VALUES FROM THE LEACH SOLUTION.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |