US3171735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of arsenical drosses
Assignee: Metallurgical Processes Ltd
•
Filing: 1961-06-27
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Granted: 1965-03-02
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Gray Philip Malcolm James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:20
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/04; C22B19/00; C22B19/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF TREATING ZINCIFEROUS ARSENICAL DROSSES ARISING IN CONNECTION WITH THE OPERATION OF A ZINC BLASTFURNACE, SAID DROSS CONTAINING CHLORIDE FLUX, WHICH COMPRISES LEACHING THE ARSENICAL DROSS CONTAINING THE CHLORIDE FLUX IN A BATH OF MOLTEN LEAD AT BETWEEN 500*-650*C. TO REMOVE A SUBSTANTIAL AMOUNT OF ARSENIC BY VOLITILIZATION AND BY SOLUTION IN THE LEAD AND SUBSEQUENTLY CONDITIONING THE LEACHED DROSS FOR ABOUT 20-60 MINUTES WITH ABOUT 2 TO 10% OF ITS WEIGHT OF WATER TO RENDER THE DROSS SUBSTANTIALLY IMMUNE TO THE EVOLUTION OF ARSINE UPON CONTACT WITH FURTHER QUANTITIES OF WATER.
Claim 2
Independent Claim
94 words
A METHOD OF TREATING ZINCIFEROUS ARSENICAL DROSSES ARISING IN CONNECTION WITH THE OPERATION OF A ZINC BLASTFURNACE, SAID DROSS CONTAINING CHLORIDE FLUX, WHICH COMPRISES LEACHING THE ARSENICAL DROSS CONTAINING THE CHLORIDE FLUX IN A BATH OF MOLTEN LEAD AT BETWEEN 500*-650*C. TO REMOVE A SUBSTANTIAL AMOUNT OF ARSENIC BY VOLITILIZATION AND BY SOLUTION IN THE LEAD AND SUBSEQUENTLY CONDITIONING THE LEACHED DROSS FOR ABOUT 20-60 MINUTES WITH ABOUT 2 TO 10% OF ITS WEIGHT OF WATER TO RENDER THE DROSS SUBSTANTIALLY IMMUNE TO THE EVOLUTION OF ARSINE UPON CONTACT WITH FURTHER QUANTITIES OF WATER.
References Cited (Backward Citations)
US1931285A
Cited
US2464262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |