US3112178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing tio2
Assignee: Champion Papers Inc
•
Filing: 1961-01-27
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Granted: 1963-11-26
•
Expires: 1981-01-27
Abstract
No abstract record available.
Inventors
- 👤 Judd Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:27
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD FOR THE PREPARATION OF AN ESSENTIALLY IRON FREE TITANIUM DIOXIDE PRODUCT FROM AN ORE COMPRISED OF TITANIUM DIOXIDE PHYSICALLY HELD IN A FINE MATRIX OF HEMATITE WHICH COMPRISES THE STEPS OF (A) SUBJECTING SAID ORE TO A GASEOUS REDUCING AGENT AT A TEMPERATURE OF AT LEAST 500*C. FOR A PERIOD SUFFICIENT TO REDUCE AT LEAST 70% BY WEIGHT OF IRON OXIDES IN THE ORE TO METALLIC IRON, (B) MAGNETICALLY SEPARATING THE MAGNETIC IRON TITANIUM FRACTION FROM THE NON-MAGNETIC GANGUE, (C) LEACHING THE SAID MAGNETIC FRACTION WITH A DILUTE AQUEOUS SOLUTION OF A MINERAL ACID TO REMOVE THE METALLIC IRON THEREFROM AND TO PRODUCE A TITANIUM DIOXIDE RESIDUE IN AN OXIDIZING ATMOSPHERE WITH AN AMOUNT OF CHLORINE IN EXCESS OF THAT REQUIRED TO REACT WITH THE COLORED OXIDE IMPURITIES PRESENT IN SAID RESIDUE TO PRODUCE AN ESSENTIALLY IRON FREE WHITE TITANIUM DIOXIDE PRODUCT.
Claim 2
Independent Claim
144 words
A METHOD FOR THE PREPARATION OF AN ESSENTIALLY IRON FREE TITANIUM DIOXIDE PRODUCT FROM AN ORE COMPRISED OF TITANIUM DIOXIDE PHYSICALLY HELD IN A FINE MATRIX OF HEMATITE WHICH COMPRISES THE STEPS OF (A) SUBJECTING SAID ORE TO A GASEOUS REDUCING AGENT AT A TEMPERATURE OF AT LEAST 500*C. FOR A PERIOD SUFFICIENT TO REDUCE AT LEAST 70% BY WEIGHT OF IRON OXIDES IN THE ORE TO METALLIC IRON, (B) MAGNETICALLY SEPARATING THE MAGNETIC IRON TITANIUM FRACTION FROM THE NON-MAGNETIC GANGUE, (C) LEACHING THE SAID MAGNETIC FRACTION WITH A DILUTE AQUEOUS SOLUTION OF A MINERAL ACID TO REMOVE THE METALLIC IRON THEREFROM AND TO PRODUCE A TITANIUM DIOXIDE RESIDUE IN AN OXIDIZING ATMOSPHERE WITH AN AMOUNT OF CHLORINE IN EXCESS OF THAT REQUIRED TO REACT WITH THE COLORED OXIDE IMPURITIES PRESENT IN SAID RESIDUE TO PRODUCE AN ESSENTIALLY IRON FREE WHITE TITANIUM DIOXIDE PRODUCT.
References Cited (Backward Citations)
US1542350A
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US1845342A
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US2184884A
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US2631941A
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US2631924A
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US2848303A
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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) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |