US3305345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetizing-roasting of iron ore
Assignee: Dravo Corp
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Filing: 1963-08-22
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Granted: 1967-02-21
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Expires: 1983-08-22
Abstract
No abstract record available.
Inventors
- 👤 Rausch Hans
- 👤 Koch Walter
- 👤 Meiler Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:36
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; B; B03; B03B; B03B1/00; B03B1/02; B03C; B03C1/00; B03C1/005; B03C1/015; C21; C21B; C21B13/00; C21B13/08; C22B1/14; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE METHOD OF EFFECTING THE ROASTING OF HEMATITE ORE TO EFFECT REDUCTION OF FE2O3 TO FE3O4 COMPRISING THE STEPS OF MIXING THE ORE WITH HEAVY FUEL OIL IN AN AMOUNT AT LEAST THEORETICALLY NECESSARY TO EFFECT SAID REACTION, HEATING SAID MIXTURE IN A CLOSED ENVIRONMENT TO A TEMPERATURE OF APPROXIMATELY 800*C. TO FORM GASEOUS PYROLYSIS PRODUCTS FROM THE HEATING OF THE OIL AND NASCENT OIL COKE IN SAID ENVIRONMNT AND INTRODUCING SUFFICIENT OXYGEN INTO SAID ENVIRONMENT TO BURN SAID GASEOUS PYROLYSIS PRODUCTS WITHOUT HEAVY SOOT FORMATION WHEREBY SAID NASCENT OIL COKE IS DIFFUSED THROUGH THE BED IN SITU AND FUNCTIONS AS THE REDUCING REACTANT.
Claim 2
Independent Claim
104 words
THE METHOD OF EFFECTING THE ROASTING OF HEMATITE ORE TO EFFECT REDUCTION OF FE2O3 TO FE3O4 COMPRISING THE STEPS OF MIXING THE ORE WITH HEAVY FUEL OIL IN AN AMOUNT AT LEAST THEORETICALLY NECESSARY TO EFFECT SAID REACTION, HEATING SAID MIXTURE IN A CLOSED ENVIRONMENT TO A TEMPERATURE OF APPROXIMATELY 800*C. TO FORM GASEOUS PYROLYSIS PRODUCTS FROM THE HEATING OF THE OIL AND NASCENT OIL COKE IN SAID ENVIRONMNT AND INTRODUCING SUFFICIENT OXYGEN INTO SAID ENVIRONMENT TO BURN SAID GASEOUS PYROLYSIS PRODUCTS WITHOUT HEAVY SOOT FORMATION WHEREBY SAID NASCENT OIL COKE IS DIFFUSED THROUGH THE BED IN SITU AND FUNCTIONS AS THE REDUCING REACTANT.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |