US3010791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silica pigment
Assignee: PPG Industries Inc
•
Filing: 1957-08-02
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Granted: 1961-11-28
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Expires: 1977-08-02
Abstract
No abstract record available.
Inventors
- 👤 Edward M Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:53
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09C3/00; C09C3/04; C09C3/041; C09C3/043; C09C3/046; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; C01P2006/22; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF PREPARING A SILICA PIGMENT CAPABLE OF BEING DISPERSED IN RUBBERY COMPOSITIONS WHICH COMPRISES HEATING A MIXTURE OF WATER AND A FINELY-DIVIDED, PRECIPITATED SILICA PIGMENT HAVING AN AVERAGE, ULTIMATE PARTICLE SIZE BELOW 0.05 MICRON AT A TEMPERATURE HIGH ENOUGH TO EVAPORATE WATER THEREFROM, PERMITTING THE PARTICLES TO AGGLOMERATE TOGETHER DURING SAID HEATING AND THEREBY PRODUCING AGGLOMERATES OF SAID PARTICLES, GRINDING THE AGGLOMERATES TO PRODUCE A SILICA POWDER OF A BULK DENSITY LOWER THAN THAT OF SAID AGGLOMERATES AND HAVING A PARTICLE SIZE BELOW 150 MESH AND COMPRESSING THE RESULTING POWDER TO A HIGHER BULK DENSITY OF 15 TO 30 POUNDS PER CUBIC FOOT.
Claim 2
Independent Claim
105 words
A METHOD OF PREPARING A SILICA PIGMENT CAPABLE OF BEING DISPERSED IN RUBBERY COMPOSITIONS WHICH COMPRISES HEATING A MIXTURE OF WATER AND A FINELY-DIVIDED, PRECIPITATED SILICA PIGMENT HAVING AN AVERAGE, ULTIMATE PARTICLE SIZE BELOW 0.05 MICRON AT A TEMPERATURE HIGH ENOUGH TO EVAPORATE WATER THEREFROM, PERMITTING THE PARTICLES TO AGGLOMERATE TOGETHER DURING SAID HEATING AND THEREBY PRODUCING AGGLOMERATES OF SAID PARTICLES, GRINDING THE AGGLOMERATES TO PRODUCE A SILICA POWDER OF A BULK DENSITY LOWER THAN THAT OF SAID AGGLOMERATES AND HAVING A PARTICLE SIZE BELOW 150 MESH AND COMPRESSING THE RESULTING POWDER TO A HIGHER BULK DENSITY OF 15 TO 30 POUNDS PER CUBIC FOOT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-27 | 1965-05-29 | 1965-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-27 | 1969-05-29 | 1969-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-27 | 1973-05-29 | 1973-11-28 | $7700.00 | Window Closed / Lapsed |