Patent US4433060A successfully refreshed from Google Patents.
Patent US2816008A successfully refreshed from Google Patents.
US2816008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of selenium from scrap selenium rectifiers
Assignee: American Smelting and Refining Co
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Filing: 1955-12-06
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Granted: 1957-12-10
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Expires: 1975-12-06
Abstract
No abstract record available.
Inventors
- 👤 Stein Paul W Von
- 👤 Yurii E Lebedeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:49
CPC Classifications
C; C01; C01B; C01B19/00; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD OF RECOVERING SELENIUMVALUES FROM SELENIUM CONTAINED ON AN ALUMINUM METAL BASE IN SELENIUM RECTIFIER SCRAP WHICH COMPRISES IMMERSING SAID SCRAP IN A MOLTEN POOL COMPRISING AN ALKALI METAL HYDROXIDE MAIN TAINED AT A TEMPERATURE NOT IN EXCESS OF ABOUT 900* F WHEREBY SUBSTANTIALLY ALL OF THE ELEMENTAL SELENIUM IN SAID SCRAP IS REMOVED THEREFROM AND IS INCORPORATED INTO SAID ALKALI MENTAL HYDROXIDE IN ABOUT 1/2 TO 2 MINUTES WITHOUT SUBSTANTIAL EFFECT ON THE METAL BASE FROM THE THEREAFTER PHYSICALLY REMOVING THE METAL BASE IF SAID FROM THE MOLTEN POOL, AND RECOVERING THE SELENIUM VALUES CONTAINED UN THE ALKALI METAL HYDROXIDE.
Claim 2
Independent Claim
102 words
A METHOD OF RECOVERING SELENIUMVALUES FROM SELENIUM CONTAINED ON AN ALUMINUM METAL BASE IN SELENIUM RECTIFIER SCRAP WHICH COMPRISES IMMERSING SAID SCRAP IN A MOLTEN POOL COMPRISING AN ALKALI METAL HYDROXIDE MAIN TAINED AT A TEMPERATURE NOT IN EXCESS OF ABOUT 900* F WHEREBY SUBSTANTIALLY ALL OF THE ELEMENTAL SELENIUM IN SAID SCRAP IS REMOVED THEREFROM AND IS INCORPORATED INTO SAID ALKALI MENTAL HYDROXIDE IN ABOUT 1/2 TO 2 MINUTES WITHOUT SUBSTANTIAL EFFECT ON THE METAL BASE FROM THE THEREAFTER PHYSICALLY REMOVING THE METAL BASE IF SAID FROM THE MOLTEN POOL, AND RECOVERING THE SELENIUM VALUES CONTAINED UN THE ALKALI METAL HYDROXIDE.
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) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |