US2671031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonchalking titanium dioxide production
Assignee: Wyeth Holdings LLC
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Filing: 1950-05-10
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Granted: 1954-03-02
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Expires: 1970-05-10
Abstract
No abstract record available.
Inventors
- 👤 Walter R Whately
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:43
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/04; C09C3/043; C09C3/06; C09C3/063; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS OF PREPARING A TITANIUM DIOXIDE PIGMENT POSSESSING IMPROVED RESISTANCE TO CHALKING WHEREIN THE PARTICLES OF SAID PIGMENT IN AQUEOUS SLURRY ARE COATED WITH A HYDROUS ALUMINUM OXIDE, THE WEIGHT OF SAID OXIDE AS AL2O3, BEING ABOUT 0.5% TO ABOUT 5% OF THE WEIGHT OF SAID PIGMENT, AND SAID COATED PARTICLES ARE THEN HEATED, THE STEP OF HEATING THE THUS COATED PIGMENT BETWEEN ABOUT 500* C. AND THE HIGHER TEMPERATURE AT WHICH THE PIGMENT PARTICLES INCREASE IN SIZE, UNTIL THE HYDROUS ALUMINUM OXIDE IS AT LEAST PARTIALLY DEHYDRATED.
Claim 2
Dependent Claim
90 words
IN A PROCESS OF PREPARING A TITANIUM DIOXIDE PIGMENT POSSESSING IMPROVED RESISTANCE TO CHALKING WHEREIN THE PARTICLES OF SAID PIGMENT IN AQUEOUS SLURRY ARE COATED WITH A HYDROUS ALUMINUM OXIDE, THE WEIGHT OF SAID OXIDE AS AL2O3, BEING ABOUT 0.5% TO ABOUT 5% OF THE WEIGHT OF SAID PIGMENT, AND SAID COATED PARTICLES ARE THEN HEATED, THE STEP OF HEATING THE THUS COATED PIGMENT BETWEEN ABOUT 500* C. AND THE HIGHER TEMPERATURE AT WHICH THE PIGMENT PARTICLES INCREASE IN SIZE, UNTIL THE HYDROUS ALUMINUM OXIDE IS AT LEAST PARTIALLY DEHYDRATED.
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) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |