US2984629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous dispersions of pyrogenic silica
Assignee: Cabot Corp
•
Filing: 1957-11-04
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Granted: 1961-05-16
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Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Loftman
- 👤 Joseph R Thereault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:26
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/1415
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD OF FORMING A STABLE AQUEOUS DISPERSION OF PYROGENIC SILICA FROM DRY DISCRETE PARTICLES OF A 0.010-0.025 MICRON AVERAGE DIAMETER COMPRISING THE STEPS OF MECHANICALLY WORKING SAID SILICA IN THE DRY FORM UNTIL THE APPARENT BULK DENSITY OF SAMD HAS INCREASED TO BETWEEN ABOUT 6 AND ABOUT 15 LBS./CU. FT. DUE TO PARTICLE AGGLOMERATION THEREIN, MIXING THE DRY AGGLOMERATED SILICA WITH WATER, AND SUBJECTING THE RESULTING MIXTURE TO HIGH SHEAR IN THE PRESENCE OF (1) SUFFICIENT ALKALI HYDROXIDE TO BRING THE PH OF SAID MIXTURE TO BETWEEN ABOUT 8.5 AND 10.5 AND (2) A DISPERSING AGENT SELECTED FROM THE GROUP CONSISTING OF SALTS OF AN ARYL SULFONIC ACID AND AN ALKYL ARYL SULFONIC ACID.
Claim 2
Independent Claim
115 words
THE METHOD OF FORMING A STABLE AQUEOUS DISPERSION OF PYROGENIC SILICA FROM DRY DISCRETE PARTICLES OF A 0.010-0.025 MICRON AVERAGE DIAMETER COMPRISING THE STEPS OF MECHANICALLY WORKING SAID SILICA IN THE DRY FORM UNTIL THE APPARENT BULK DENSITY OF SAMD HAS INCREASED TO BETWEEN ABOUT 6 AND ABOUT 15 LBS./CU. FT. DUE TO PARTICLE AGGLOMERATION THEREIN, MIXING THE DRY AGGLOMERATED SILICA WITH WATER, AND SUBJECTING THE RESULTING MIXTURE TO HIGH SHEAR IN THE PRESENCE OF (1) SUFFICIENT ALKALI HYDROXIDE TO BRING THE PH OF SAID MIXTURE TO BETWEEN ABOUT 8.5 AND 10.5 AND (2) A DISPERSING AGENT SELECTED FROM THE GROUP CONSISTING OF SALTS OF AN ARYL SULFONIC ACID AND AN ALKYL ARYL SULFONIC ACID.
References Cited (Backward Citations)
US1969242A
Cited
US2561304A
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US2741600A
Cited
GB713211A
Cited
US2726961A
Cited
US2787968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |