Patent US2558635A successfully refreshed from Google Patents.
US2558635A
Expired / Lapsed
US
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Process for treating a magnetic iron ore
Assignee: Hanna Coal and Ore Corp
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Filing: 1947-12-15
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Granted: 1951-06-26
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Expires: 1967-12-15
Abstract
No abstract record available.
Inventors
- 👤 Dmitri N Vedensky
- 👤 Jr Leslie J Bechaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
B; B03; B03C; B03C1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR TREATING A MAGNETIC IRON ORE COMPRISING GRINDING THE ORE TO FINELY DIVIDED FORM, SEPARATING NON-MAGNETIZABLE PARTICLES FROM THE FINELY DIVIDED ORE, DEMAGNETIZING REMAINING FINELY DIVIDED ORE, HYDRAULICALLY CLASSIFYING THE DEMAGNETIZED ORE INTO AT LEAST THREE
Claim 2
Dependent Claim
38 words
A PROCESS FOR TREATING A MAGNETIC IRON ORE COMPRISING GRINDING THE ORE TO FINELY DIVIDED FORM, SEPARATING NON-MAGNETIZABLE PARTICLES FROM THE FINELY DIVIDED ORE, DEMAGNETIZING REMAINING FINELY DIVIDED ORE, HYDRAULICALLY CLASSIFYING THE DEMAGNETIZED ORE INTO AT LEAST THREE
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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |