Patent US2503692A successfully refreshed from Google Patents.
US2503692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of titanium dioxide pigments
Assignee: Wyeth Holdings LLC
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Filing: 1946-05-31
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Granted: 1950-04-11
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Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Tanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:12
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0532; C01G23/0534; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A PROCESS FOR PREPARING TITANIUM DIOXIDE, THE STEP WHICH COMPRISES HYDROLYZING AN AQUEOUS SOLUTION OF A TITANIUM SULFATE SOLUTION CONTAINING FROM ABOUT 12% TO ABOUT 16% TITANIUM DIOXIDE IN THE PRESENCE OF A SMALL AMOUNT OF AN ALKALI METAL TITANATE, SAID ALKALI METAL TITANATE HAVING BEEN PREPARED BY BOILING AN AQUEOUS SLURRY OF A PURIFIED TITANIUM SULFATE HYDROLYSATE IN THE PRESENCE OF AN ALKALI METAL HYDROXIDE FOR FROM ABOUT 1 TO ABOUT 6 HOURS, FILTERING THE MIXTURE, AND WASHING THE EXCESS ALKALI FROM THE RESIDUE.
Claim 2
Dependent Claim
86 words
IN A PROCESS FOR PREPARING TITANIUM DIOXIDE, THE STEP WHICH COMPRISES HYDROLYZING AN AQUEOUS SOLUTION OF A TITANIUM SULFATE SOLUTION CONTAINING FROM ABOUT 12% TO ABOUT 16% TITANIUM DIOXIDE IN THE PRESENCE OF A SMALL AMOUNT OF AN ALKALI METAL TITANATE, SAID ALKALI METAL TITANATE HAVING BEEN PREPARED BY BOILING AN AQUEOUS SLURRY OF A PURIFIED TITANIUM SULFATE HYDROLYSATE IN THE PRESENCE OF AN ALKALI METAL HYDROXIDE FOR FROM ABOUT 1 TO ABOUT 6 HOURS, FILTERING THE MIXTURE, AND WASHING THE EXCESS ALKALI FROM THE 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) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |