US2870003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of converting hematite to magnetite
Assignee: Ortech Corp
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Filing: 1957-06-17
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Granted: 1959-01-20
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Expires: 1977-06-17
Abstract
No abstract record available.
Inventors
- 👤 Patrick E Cavanagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:38
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE METHOD OF CONVERTING HEMATITE AT LEAST PARTIALLY TO MAGNETITE WHICH COMPRISES CRUSHING THE HEMATITE TO AT LEAST 150 MESH. FEEDING THE CRUSHED HEMATITE DOWNWARDLY INTO A DOWNWARDLY DIRECTED REDUCING FLAME CONCURRENTLY SO AS TO ENTRAIN THE CRUSHED HEMATITE IN THE FLAME, PASSING THE PRODUCTS OF COMBUSTION WITH ENTRAINED DUST INTO A SEPARATING ZONE, AND PERMITTING THE SOLID PARTICLES TO SETTLE, WHILE REMOVING THE GASEOUS PRODUCTS OF COMBUSTION SEPARATELY THEREFROM.
Claim 2
Independent Claim
70 words
THE METHOD OF CONVERTING HEMATITE AT LEAST PARTIALLY TO MAGNETITE WHICH COMPRISES CRUSHING THE HEMATITE TO AT LEAST 150 MESH. FEEDING THE CRUSHED HEMATITE DOWNWARDLY INTO A DOWNWARDLY DIRECTED REDUCING FLAME CONCURRENTLY SO AS TO ENTRAIN THE CRUSHED HEMATITE IN THE FLAME, PASSING THE PRODUCTS OF COMBUSTION WITH ENTRAINED DUST INTO A SEPARATING ZONE, AND PERMITTING THE SOLID PARTICLES TO SETTLE, WHILE REMOVING THE GASEOUS PRODUCTS OF COMBUSTION SEPARATELY THEREFROM.
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |