US2607659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing lead titanate pigments
Assignee: Akzo Nobel Paints LLC
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Filing: 1948-12-01
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Granted: 1952-08-19
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Expires: 1968-12-01
Abstract
No abstract record available.
Inventors
- 👤 Frank O Rummery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:52
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/003; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF PREPARING LEAD TITANATE PIGMENT DIRECTLY IN A SINGLE CALCINATION FROM PIGMENTARY TITANIUM DIOXIDE AND REACTIVE LEAD OXIDE WHICH CONSISTS OF: PROVIDING IN INTIMATE MIXTURE COMPOSED ESSENTIALLY OF CALCINED, PIGMENTARY TITANIUM DIOXIDE HAVING A PARTICLE SIZE BELOW ABOUT 0.5 MICRON AND REACTIVE LEAD OXIDE HAVING A PARTICLE SIZE BELOW ABOUT 0.5 MICRON, SAID MIXTURE BEING FREE OF METALLIC LEAD AND BEING PROPORTIONED SO AS TO HAVE THEREIN AT LEAST ONE AND NOT MORE THAN ABOUT 1.2 MOLS OF TIO2 PER MOL OF LEAD OXIDE; AND CALCINING SAID MIXTURE DIRECTLY TO LEAD TITANATE PIGMENT BY HEATING IT BETWEEN ABOUT 600* C. AND 750* C. IN A NON-REDUCING TO OXIDIZING ATMOSPHERE UNTIL ALL OF THE LEAD OXIDE HAS BECOME COMBINED CHEMICALLY WITH THE TITANIUM DIOXIDE AND THE RESULTING LEAD TITANATE HAS A PARTICLE SIZE OF DESIRED PIGMENTARY DIMENSIONS BELOW ABOUT 0.5 MICRON.
Claim 2
Independent Claim
142 words
THE METHOD OF PREPARING LEAD TITANATE PIGMENT DIRECTLY IN A SINGLE CALCINATION FROM PIGMENTARY TITANIUM DIOXIDE AND REACTIVE LEAD OXIDE WHICH CONSISTS OF: PROVIDING IN INTIMATE MIXTURE COMPOSED ESSENTIALLY OF CALCINED, PIGMENTARY TITANIUM DIOXIDE HAVING A PARTICLE SIZE BELOW ABOUT 0.5 MICRON AND REACTIVE LEAD OXIDE HAVING A PARTICLE SIZE BELOW ABOUT 0.5 MICRON, SAID MIXTURE BEING FREE OF METALLIC LEAD AND BEING PROPORTIONED SO AS TO HAVE THEREIN AT LEAST ONE AND NOT MORE THAN ABOUT 1.2 MOLS OF TIO2 PER MOL OF LEAD OXIDE; AND CALCINING SAID MIXTURE DIRECTLY TO LEAD TITANATE PIGMENT BY HEATING IT BETWEEN ABOUT 600* C. AND 750* C. IN A NON-REDUCING TO OXIDIZING ATMOSPHERE UNTIL ALL OF THE LEAD OXIDE HAS BECOME COMBINED CHEMICALLY WITH THE TITANIUM DIOXIDE AND THE RESULTING LEAD TITANATE HAS A PARTICLE SIZE OF DESIRED PIGMENTARY DIMENSIONS BELOW ABOUT 0.5 MICRON.
References Cited (Backward Citations)
GB405340A
Cited
GB416615A
Cited
FR765833A
Cited
US2140222A
Cited
US2166221A
Cited
US2213542A
Cited
US2419246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |