US3105743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of substantially pure titanium dioxide
Assignee: NL Industries Inc
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Filing: 1961-12-04
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Granted: 1963-10-01
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Expires: 1981-12-04
Abstract
No abstract record available.
Inventors
- 👤 Vincent J Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:46
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/08; C01G23/053; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B9/00; C01P; C01P2004/00; C01P2004/60; C01P2006/00; C01P2006/11; C01P2006/20; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
METHOD FOR PREPARING FINELY DIVIDED TITANIUM DIOXIDE HAVING THE CRYSTAL STRUCTURE OF ANATASE AND ADAPTABLE FOR USE AS FEED MATERIAL FOR THE PREPARATION OF SINGLE CRYSTAL BOULES WHICH COMPRISES ADMIXING AQUEOUS SOLUTIONS OF TITANIUM TETRACHLORIDE, OXALIC ACID AND AMMONIUM CHLORIDE TO PRECIPITATE AN AMMONIUM TITANIUM CHLORIDE OXALATE COMPOSITION, THE AMOUNT OF SAID OXALIC ACID BEING FROM 0.5 TO 1.0 MOLE AND THE AMOUNT OF SAID AMMONIUM CHLORIDE BEING FROM 0.75 TO 3.0 MOLES FOR EACH MOLE OF TITANIUM TETRACHLORIDE ADDED, SAID SOLUTIONS BEING REACTED AT A TEMPERATURE OF FROM 30*C. TO 80*C., REMOVING SAID PRECIPITATED COMPOSITION FROM SOLUTION AND CALCINING SAID COMPOSITION AT FROM 600*C. TO 700*C. TO VOLATILIZE THE AMMONIUM, CHLORIDE AND OXALATE VALUES AND TO FORM TITANIUM DIOXIDE IN THE ANATASE FORM.
Claim 2
Dependent Claim
124 words
METHOD FOR PREPARING FINELY DIVIDED TITANIUM DIOXIDE HAVING THE CRYSTAL STRUCTURE OF ANATASE AND ADAPTABLE FOR USE AS FEED MATERIAL FOR THE PREPARATION OF SINGLE CRYSTAL BOULES WHICH COMPRISES ADMIXING AQUEOUS SOLUTIONS OF TITANIUM TETRACHLORIDE, OXALIC ACID AND AMMONIUM CHLORIDE TO PRECIPITATE AN AMMONIUM TITANIUM CHLORIDE OXALATE COMPOSITION, THE AMOUNT OF SAID OXALIC ACID BEING FROM 0.5 TO 1.0 MOLE AND THE AMOUNT OF SAID AMMONIUM CHLORIDE BEING FROM 0.75 TO 3.0 MOLES FOR EACH MOLE OF TITANIUM TETRACHLORIDE ADDED, SAID SOLUTIONS BEING REACTED AT A TEMPERATURE OF FROM 30*C. TO 80*C., REMOVING SAID PRECIPITATED COMPOSITION FROM SOLUTION AND CALCINING SAID COMPOSITION AT FROM 600*C. TO 700*C. TO VOLATILIZE THE AMMONIUM, CHLORIDE AND OXALATE VALUES AND TO FORM TITANIUM DIOXIDE IN THE ANATASE FORM.
References Cited (Backward Citations)
US2027812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |