US2771345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of titanium dioxide pigments
Assignee: Wyeth Holdings LLC
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Filing: 1951-06-01
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Granted: 1956-11-20
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Expires: 1971-06-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Tanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:05
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/1259; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD FOR THE PURIFICATION OF A WATER-WASHED TITANIA HYDROLYSATE CONTAINING PHOSPHATIC IMPURITIES, WHICH COMPRISES (1) MIXING AN AMOUNT OF AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF SAID HYDROLYSATE SUFFICIENT TO FORM WATER-SOLUBLE COMPLEXES OF SAID IMPURITIES AND ADJUST THE PH OF THE SLURRY TO AT LEAST 8.5 BUT INSUFFICIENT TO CONVERT SAID HYDROLYSATE TO ALKALI METAL TITANATE AND DIGESTING SAID MIXTURE AT A TEMPERATURE BETWEEN 50* C. AND THE BOILING POINT THEREOF UNTIL SOLUBILIZATION OF SAID IMPURITIES IS SUBSTANTIALLY COMPLETE; (2) FILTERING AND WATER-WASHING SAID ALKALI-TREATED HYDROLYSATE THEREBY REMOVING ALKALI-SOLUBILIZED IMPURITIES INCLUDING PHOSPHATIC IMPURITIES; (3) SLURRYING SAID HYDROLYSATE WITH WATER AND SUFFICIENT OF A DILUTE MINERAL ACID HAVING AN ANION VOLATILE AT 850*C. TO DECREASE THE PH OF THE SLURRY TO BELOW 4; (4) DIGESTING SAID SLURRY UNTIL THE ABSORPTIVE CAPACITY OF SAID HYDROLYSATE FOR SAID ACID IS SUBSTANTIALLY SATISFIED; AND (5) FILTERING AND WATERWASHING SAID ACID-TREATED HYDROLYSATE THEREBY REMOVING ACID-SOLUBLIZED IMPURITIES.
Claim 2
Independent Claim
155 words
A METHOD FOR THE PURIFICATION OF A WATER-WASHED TITANIA HYDROLYSATE CONTAINING PHOSPHATIC IMPURITIES, WHICH COMPRISES (1) MIXING AN AMOUNT OF AN ALKALI METAL HYDROXIDE WITH AN AQUEOUS SLURRY OF SAID HYDROLYSATE SUFFICIENT TO FORM WATER-SOLUBLE COMPLEXES OF SAID IMPURITIES AND ADJUST THE PH OF THE SLURRY TO AT LEAST 8.5 BUT INSUFFICIENT TO CONVERT SAID HYDROLYSATE TO ALKALI METAL TITANATE AND DIGESTING SAID MIXTURE AT A TEMPERATURE BETWEEN 50* C. AND THE BOILING POINT THEREOF UNTIL SOLUBILIZATION OF SAID IMPURITIES IS SUBSTANTIALLY COMPLETE; (2) FILTERING AND WATER-WASHING SAID ALKALI-TREATED HYDROLYSATE THEREBY REMOVING ALKALI-SOLUBILIZED IMPURITIES INCLUDING PHOSPHATIC IMPURITIES; (3) SLURRYING SAID HYDROLYSATE WITH WATER AND SUFFICIENT OF A DILUTE MINERAL ACID HAVING AN ANION VOLATILE AT 850*C. TO DECREASE THE PH OF THE SLURRY TO BELOW 4; (4) DIGESTING SAID SLURRY UNTIL THE ABSORPTIVE CAPACITY OF SAID HYDROLYSATE FOR SAID ACID IS SUBSTANTIALLY SATISFIED; AND (5) FILTERING AND WATERWASHING SAID ACID-TREATED HYDROLYSATE THEREBY REMOVING ACID-SOLUBLIZED IMPURITIES.
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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |