Patent US2723902A successfully refreshed from Google Patents.
US2723902A
Expired / Lapsed
US
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Method for the treatment of iron ore
Assignee: United Steel Companies Ltd
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Filing: 1950-07-18
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Granted: 1955-11-15
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Expires: 1970-07-18
Abstract
No abstract record available.
Inventors
- 👤 Reeve Lewis
- 👤 Wells Geoffrey Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:38
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR OBTAINING SUBSTANTIALLY PURE FERRIC CHLORIDE FROM IRON ORE CONTAINING FERRIC OXIDE BUT SUBSTANTIALLY FREE FROM TITANIA WHICH COMPRISES FIRST TREATING THE ORE WITH HYDROCHLORIC ACID GAS AT A TEMPERATURE HIGH ENOUGH TO VAPORIZE WATER RESULTING FROM SUCH TREATMENT BUT NOT EXCEEDING 200* C., THEREBY PRODUCING FERRIC CHLORIDE AND WATER VAPOR, SEPARATING FROM THE ORE A SUBSTANTIALL PROPORTION OF SAID WATER VAPOR WITH NOT MORE THAN A SMALL AMOUNT OF FERRIC CHLORIDE, THEN TREATING THE ORE WITH FURTHER HYDROCHLORIC ACID GAS AT A TEMPERATURE BETWEEN 200 AND ABOUT 400*C. TO VOLATILIZE BOTH THE FERRIC CHLORIDE ALREADY PRESENT AND ADDITIONAL FERRIC CHLORIDE FORMED FROM THE ORE, AND REMOVING THE VOLATILIZED SUBSTANTIALLY PURE FERRIC CHLORIDE FROM THE SOLID RESIDUE.
Claim 2
Dependent Claim
119 words
A PROCESS FOR OBTAINING SUBSTANTIALLY PURE FERRIC CHLORIDE FROM IRON ORE CONTAINING FERRIC OXIDE BUT SUBSTANTIALLY FREE FROM TITANIA WHICH COMPRISES FIRST TREATING THE ORE WITH HYDROCHLORIC ACID GAS AT A TEMPERATURE HIGH ENOUGH TO VAPORIZE WATER RESULTING FROM SUCH TREATMENT BUT NOT EXCEEDING 200* C., THEREBY PRODUCING FERRIC CHLORIDE AND WATER VAPOR, SEPARATING FROM THE ORE A SUBSTANTIALL PROPORTION OF SAID WATER VAPOR WITH NOT MORE THAN A SMALL AMOUNT OF FERRIC CHLORIDE, THEN TREATING THE ORE WITH FURTHER HYDROCHLORIC ACID GAS AT A TEMPERATURE BETWEEN 200 AND ABOUT 400*C. TO VOLATILIZE BOTH THE FERRIC CHLORIDE ALREADY PRESENT AND ADDITIONAL FERRIC CHLORIDE FORMED FROM THE ORE, AND REMOVING THE VOLATILIZED SUBSTANTIALLY PURE FERRIC CHLORIDE FROM THE SOLID RESIDUE.
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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) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |