US2924510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing pigments
Assignee: Columbia Southern Chemical Corp
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Filing: 1956-12-24
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Granted: 1960-02-09
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Allen Edward Merle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; B; B82; B82Y; B82Y30/00; C01B33/187; C01B33/193; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3027; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A METHOD OF DRYING A MOIST SILICA-WATER COMPOSITION HAVING THE CONSISTENCY OF A FILTER CAKE, CONTAINING BOUND WATER AND AT LEAST 70 PERCENT FREE WATER BY WEIGHT, AND HAVING A STICKY CHARACTERISTIC, SAID SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE BELOW 0.1 MICRON AND A SURFACE AREA BETWEEN 95 AND 800 SQUARE METERS PER GRAM, WHICH COMPRISES MIXING AT LEAST ABOUT 1 PART BY WEIGHT OF A PARTIALLY DRIED SILICA-WATER MIXTURE CONTAINING BOUND WATER AND ABOUT 20-50 PERCENT FREE WATER WITH ABOUT 10 PARTS BY WEIGHT OF THE MOIST SILICA-WATER COMPOSITION TO FORM AN ADMIXTURE OF GREATLY REDUCED STICKINESS AND FREE WATER CONTENT, HEATING SAID ADMIXTURE TO DRIVE OFF WATER VAPOR IN THE FORM OF STEAM AND TO LEAVE A DRY PIGMENTARY SILICA PRODUCT HAVING A FREE WATER CONTENT BELOW ABOUT 10 PERCENT BY WEIGHT, WHILE SIMULTANEOUSLY CAUSING ENTRAINMENT OF A PORTION OF THE SILICA IN THE EVOLVED WATER VAPOR, SEPARATING SAID ENTRAINED SILICA FROM SAID VAPOR IN THE FORM OF A SILICA WATER MIXTURE AND RECYCLING THE SEPARATED SILICA AS SAID PARTIALLY DRIED SILICA-WATER MIXTURE.
Claim 2
Independent Claim
176 words
A METHOD OF DRYING A MOIST SILICA-WATER COMPOSITION HAVING THE CONSISTENCY OF A FILTER CAKE, CONTAINING BOUND WATER AND AT LEAST 70 PERCENT FREE WATER BY WEIGHT, AND HAVING A STICKY CHARACTERISTIC, SAID SILICA HAVING AN AVERAGE ULTIMATE PARTICLE SIZE BELOW 0.1 MICRON AND A SURFACE AREA BETWEEN 95 AND 800 SQUARE METERS PER GRAM, WHICH COMPRISES MIXING AT LEAST ABOUT 1 PART BY WEIGHT OF A PARTIALLY DRIED SILICA-WATER MIXTURE CONTAINING BOUND WATER AND ABOUT 20-50 PERCENT FREE WATER WITH ABOUT 10 PARTS BY WEIGHT OF THE MOIST SILICA-WATER COMPOSITION TO FORM AN ADMIXTURE OF GREATLY REDUCED STICKINESS AND FREE WATER CONTENT, HEATING SAID ADMIXTURE TO DRIVE OFF WATER VAPOR IN THE FORM OF STEAM AND TO LEAVE A DRY PIGMENTARY SILICA PRODUCT HAVING A FREE WATER CONTENT BELOW ABOUT 10 PERCENT BY WEIGHT, WHILE SIMULTANEOUSLY CAUSING ENTRAINMENT OF A PORTION OF THE SILICA IN THE EVOLVED WATER VAPOR, SEPARATING SAID ENTRAINED SILICA FROM SAID VAPOR IN THE FORM OF A SILICA WATER MIXTURE AND RECYCLING THE SEPARATED SILICA AS SAID PARTIALLY DRIED SILICA-WATER MIXTURE.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |