Patent US2752301A successfully refreshed from Google Patents.
US2752301A
Expired / Lapsed
US
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Recovery of chromium and iron values from chromium-iron ores
Assignee: Individual
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Filing: 1951-03-07
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Granted: 1956-06-26
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Expires: 1971-03-07
Abstract
No abstract record available.
Inventors
- 👤 Hugh S Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:20
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR BENEFICIATING CHROMITE TO INCREASE THE CHROMIUM TO-IRON RATIO BY SELECTIVELY FORMING AND SUBLIMING FERROUS CHLORIDE, COMPRISING CONTACTING THE ORE IN A CHAMBER AT A TEMPERATURE ABOVE ABOUT 850* C. UNDER ANHYDROUS CONDITIONS WITH A GASEOUS REAGENT CONSISTING ESSENTIALLY OF DRY HYDROGEN CHLORIDE, AND REMOVING GASEOUS FERROUS CHLORIDE FROM SAID CHAMBER AS IT IS FORMED; FREE CHLORIDE AND ACTIVE OXIDIZING GASES AND ACTIVE REDUCING GASES BEING EXCLUDED FROM SAID CHAMBER DURING THE REACTION, AND ANY FREE CARBON IN THE CHAMBER DURING THE REACTION BEING LIMITED TO AN AMOUNT NOT EXCEEDING ONE PART TO SIX PARTS BY WEIGHT OF ANY IRON OXIDE LEFT IN THE ORE RESIDUE AT THE END OF THE REACTION, WHEREBY SUBSTANTIALLY THE ENTIRE CHROMIUM CONTENT OF THE ORE REMAINS AS OXIDE IN THE ORE RESIDUE.
Claim 2
Dependent Claim
130 words
A PROCESS FOR BENEFICIATING CHROMITE TO INCREASE THE CHROMIUM TO-IRON RATIO BY SELECTIVELY FORMING AND SUBLIMING FERROUS CHLORIDE, COMPRISING CONTACTING THE ORE IN A CHAMBER AT A TEMPERATURE ABOVE ABOUT 850* C. UNDER ANHYDROUS CONDITIONS WITH A GASEOUS REAGENT CONSISTING ESSENTIALLY OF DRY HYDROGEN CHLORIDE, AND REMOVING GASEOUS FERROUS CHLORIDE FROM SAID CHAMBER AS IT IS FORMED; FREE CHLORIDE AND ACTIVE OXIDIZING GASES AND ACTIVE REDUCING GASES BEING EXCLUDED FROM SAID CHAMBER DURING THE REACTION, AND ANY FREE CARBON IN THE CHAMBER DURING THE REACTION BEING LIMITED TO AN AMOUNT NOT EXCEEDING ONE PART TO SIX PARTS BY WEIGHT OF ANY IRON OXIDE LEFT IN THE ORE RESIDUE AT THE END OF THE REACTION, WHEREBY SUBSTANTIALLY THE ENTIRE CHROMIUM CONTENT OF THE ORE REMAINS AS OXIDE IN THE ORE RESIDUE.
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) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |