Patent US2721813A successfully refreshed from Google Patents.
US2721813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Galvanizing method, including a removal of metallic iron from zinc-containing materials such as metallic zinc and iron-zinc compounds
Assignee: Individual
•
Filing: 1952-01-18
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Granted: 1955-10-25
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Expires: 1972-01-18
Abstract
No abstract record available.
Inventors
- 👤 Holmberg Tor Fjalar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:43
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD OF SEPARATING ZINC CONTAINED IN ZINC-IRON ALLOYS, ZINC DROSS AND REDUCED ZINC IN IRON-BEARING ZINC ORES COMPRISING INTRODUCING THE ZINC-IRON MATERIAL INTO A MOLTEN LED BATH MAINTAINED AT A TEMPERATURE ABOVE ABOUT 600* C. WHEREBY ZINC IS DISSOLVED IN THE LEAD AND IRON, WHICH IS INSOLUBLE IN SAID LEAD, FLOATS ON THE SURFACE OF SAID BATH, SEPARATING THE INSOLUBLE IRON FROM SAID BATH, LOWERING THE TEMPERATURE OF SAID BATH TO ABOUT 420*-460* C, WHEREBY AN UPPER LAYER OF ZINC SEPARATES WHICH IS ADAPTED TO BE REMOVED FROM SAID BATH AT SAID LOWER TEMPERATURE.
Claim 2
Independent Claim
95 words
A METHOD OF SEPARATING ZINC CONTAINED IN ZINC-IRON ALLOYS, ZINC DROSS AND REDUCED ZINC IN IRON-BEARING ZINC ORES COMPRISING INTRODUCING THE ZINC-IRON MATERIAL INTO A MOLTEN LED BATH MAINTAINED AT A TEMPERATURE ABOVE ABOUT 600* C. WHEREBY ZINC IS DISSOLVED IN THE LEAD AND IRON, WHICH IS INSOLUBLE IN SAID LEAD, FLOATS ON THE SURFACE OF SAID BATH, SEPARATING THE INSOLUBLE IRON FROM SAID BATH, LOWERING THE TEMPERATURE OF SAID BATH TO ABOUT 420*-460* C, WHEREBY AN UPPER LAYER OF ZINC SEPARATES WHICH IS ADAPTED TO BE REMOVED FROM SAID BATH AT SAID LOWER TEMPERATURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |