Patent US3067957A successfully refreshed from Google Patents.
US3067957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of upgrading iron ore concentrates
Assignee: Cleveland Cliffs Iron Co
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Filing: 1959-09-08
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Granted: 1962-12-11
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Expires: 1979-09-08
Abstract
No abstract record available.
Inventors
- 👤 Louis J Erck
- 👤 Nummela Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:18
CPC Classifications
B; B03; B03B; B03B9/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
THE METHOD OF INCREASING THE IRON CONTENT IN AN IRON OXIDE ORE RICH FROTH PRODUCT OF FLOTATION OF THE ORE IN A FATTY ACID REAGENT WHICH COMPRISES THE STEPS OF REGRINDING SUCH IRON ORE RICH FROTH PRODUCT TO PRODUCE A PULP MATERIAL, HEAT CONDITIONING SUCH REGROUND PULP BY HEATING IT TO THE APPARENT BOILING TEMPERATURE OF THE PULP, SUBJECTING SUCH REGROUND AND HEAT CONDITIONED PULP TO TREATMENT IN FLOTATION CELL IN THE PRESENCE OF ADDED WATER AND THE
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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) | 1965-12-10 | 1966-06-11 | 1966-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-10 | 1970-06-11 | 1970-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-10 | 1974-06-11 | 1974-12-11 | $7700.00 | Window Closed / Lapsed |