Patent US2939783A successfully refreshed from Google Patents.
US2939783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc refining
Assignee: Individual
•
Filing: 1958-05-16
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Granted: 1960-06-07
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Expires: 1978-05-16
Abstract
No abstract record available.
Inventors
- 👤 Lundevall Gustav Blom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:14
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A CONTINUOUS PROCESS OF REFINING IMPURE ZINC WHICH COMPRISES MELTING A CHARGE OF ZINC-BEARING ALLOY, CONDUCTING THE RESULTANT MELT TO A FIRST DISTILLATION ZONE, MAINTAINING THE TEMPERATURE OF THE MELT IN SAID ZONE SUBSTANTIALLY AT THE BOILING POINT OF THE ZINC THEREBY GENERATING PURIFIED ZINC VAPORS, WITHDRAWING SAID VAPORS FROM SAID ZONE, CONTINUOUSLY CONDUCTING MELT FROM SAID ZONE FURTHER TO A SECOND DISTILLATION ZONE, MAINTAINING THE TEMPERATURE OF THE LATTER SUFFICIENTLY HIGH TO VAPORIZE NEARLY ALL OF THE REMAINING ZINC THEREBY GENERATING IMPURE ZINC VAPORS OF A HIGHER TEMPERATURE THAN THAT OF SAID PURIFIED VAPORS, CONDENSING VAPORS PRODUCED IN SAID SECOND ZONE, CONTINUOUSLY RETURNING THE RESULTANT CONDENSATE TO SAID FIRST DISTILLATION ZONE THEREIN SUBJECTING SAID CONDENSATE TO REDISTILLATION TOGETHER WITH THE MOLTEN CHARGE, AND WITHDRAWING IMPURE MOLTEN METAL RESIDUE FROM SAID SECOND DISTILLATION ZONE.
Claim 2
Dependent Claim
134 words
A CONTINUOUS PROCESS OF REFINING IMPURE ZINC WHICH COMPRISES MELTING A CHARGE OF ZINC-BEARING ALLOY, CONDUCTING THE RESULTANT MELT TO A FIRST DISTILLATION ZONE, MAINTAINING THE TEMPERATURE OF THE MELT IN SAID ZONE SUBSTANTIALLY AT THE BOILING POINT OF THE ZINC THEREBY GENERATING PURIFIED ZINC VAPORS, WITHDRAWING SAID VAPORS FROM SAID ZONE, CONTINUOUSLY CONDUCTING MELT FROM SAID ZONE FURTHER TO A SECOND DISTILLATION ZONE, MAINTAINING THE TEMPERATURE OF THE LATTER SUFFICIENTLY HIGH TO VAPORIZE NEARLY ALL OF THE REMAINING ZINC THEREBY GENERATING IMPURE ZINC VAPORS OF A HIGHER TEMPERATURE THAN THAT OF SAID PURIFIED VAPORS, CONDENSING VAPORS PRODUCED IN SAID SECOND ZONE, CONTINUOUSLY RETURNING THE RESULTANT CONDENSATE TO SAID FIRST DISTILLATION ZONE THEREIN SUBJECTING SAID CONDENSATE TO REDISTILLATION TOGETHER WITH THE MOLTEN CHARGE, AND WITHDRAWING IMPURE MOLTEN METAL RESIDUE FROM SAID SECOND DISTILLATION ZONE.
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |