US2889206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of selenium
Assignee: Kawecki Chemical Co
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Filing: 1953-09-30
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Granted: 1959-06-02
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Expires: 1973-09-30
Abstract
No abstract record available.
Inventors
- 👤 Martin A Hobin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:21
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
THE METHOD OF RECOVERING ELEMENTAL SELENIUMM FROM ELECTRIC RECTIFIER SCRAP IN WHICH THE SELENIUM IS IN THE FORM OF A COATING ON AN ALUMINUM BASE PLATE AND THE SELENIUM IS COATED WITH AN ADHERENT LAYER OF A NISMUTHCADMIUM ALLOY, WHICH COMPRISES SEPARTING THE SELENIUM COMPONENT AND ATHE BISMUTH-CADMIUM ALLOY FROM THE ALUMINUM BASE PLATE TO MAKE THE SELENIUM COMPONENT MORE AMENABLE OT DISSOLUTION BY SUBJECTING THE ELECTRICRECTIFIER SCRAP TO THE ACTION OF HAMMERS IN A HAMMER MIL UNTIL THE ALUMINUM BASE PLATE IS SHREDDED AND THE SELENIUM COMPONENT AND THE LAYER OF BISMUTH-CADMIUM ALLOY IS SEPARATED FROM THE SHREDDDED PIECES OF THE BASE PLATE IN THE FORM IF FINELY-DICIDED PARTICLES, SEPARATING SAID FINELY-DIVIDED PARTICLES FROM THE SHREDDED PIECES OF ALUMINUM, MAINTAINING AN ALKALI METAL SULFITE SOLUTION IN CONTACT WITH THE SEPARATED FINELY-DIVIDED PARTICLES UNTIL THE SELENIUM COMPONENT HAS BEEN SELECTIVELY DISSOLVED WITH RESULTANT FORMATION OF AN ALKALI METAL SELENOTHIOSULFATE SOLUTION, SEPARATING THE ALKALI METAL SELENOTHIOSULDATE SOLUTION FROM THE PARTICLES OF BISMUTH-CADMIUM ALLOY, DECOMPOSING THE ALKALI METAL SELENOTHIOSULFATE OF SAID SOLUTION WITH RESULTANT PRECIPITATION OF THE SELENIUM COMPONENT THEREOF AS FINELY-DIVIDED ELEMENTAL SELENIUM, AND SEPARATING THE PRECIPITATED FINELY-DIVIDED SELENIUM.
Claim 2
Independent Claim
188 words
THE METHOD OF RECOVERING ELEMENTAL SELENIUMM FROM ELECTRIC RECTIFIER SCRAP IN WHICH THE SELENIUM IS IN THE FORM OF A COATING ON AN ALUMINUM BASE PLATE AND THE SELENIUM IS COATED WITH AN ADHERENT LAYER OF A NISMUTHCADMIUM ALLOY, WHICH COMPRISES SEPARTING THE SELENIUM COMPONENT AND ATHE BISMUTH-CADMIUM ALLOY FROM THE ALUMINUM BASE PLATE TO MAKE THE SELENIUM COMPONENT MORE AMENABLE OT DISSOLUTION BY SUBJECTING THE ELECTRICRECTIFIER SCRAP TO THE ACTION OF HAMMERS IN A HAMMER MIL UNTIL THE ALUMINUM BASE PLATE IS SHREDDED AND THE SELENIUM COMPONENT AND THE LAYER OF BISMUTH-CADMIUM ALLOY IS SEPARATED FROM THE SHREDDDED PIECES OF THE BASE PLATE IN THE FORM IF FINELY-DICIDED PARTICLES, SEPARATING SAID FINELY-DIVIDED PARTICLES FROM THE SHREDDED PIECES OF ALUMINUM, MAINTAINING AN ALKALI METAL SULFITE SOLUTION IN CONTACT WITH THE SEPARATED FINELY-DIVIDED PARTICLES UNTIL THE SELENIUM COMPONENT HAS BEEN SELECTIVELY DISSOLVED WITH RESULTANT FORMATION OF AN ALKALI METAL SELENOTHIOSULFATE SOLUTION, SEPARATING THE ALKALI METAL SELENOTHIOSULDATE SOLUTION FROM THE PARTICLES OF BISMUTH-CADMIUM ALLOY, DECOMPOSING THE ALKALI METAL SELENOTHIOSULFATE OF SAID SOLUTION WITH RESULTANT PRECIPITATION OF THE SELENIUM COMPONENT THEREOF AS FINELY-DIVIDED ELEMENTAL SELENIUM, AND SEPARATING THE PRECIPITATED FINELY-DIVIDED SELENIUM.
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) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |