US2956957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing clear, homogeneous silica hydrosols
Assignee: WR Grace and Co
•
Filing: 1956-04-02
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Granted: 1960-10-18
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Expires: 1976-04-02
Abstract
No abstract record available.
Inventors
- 👤 James E Armstrong
- 👤 William P Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:14
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/142; C01B33/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF PRODUCING A CLEAR HOMOGENEOUS SILICA HYDROSOL CONTAINING ABOUT 10-22% BY WEIGHT SILICA COMPRISING INTRODUCING TO AMIXING ZONE A STREAM OF ALKALI METAL SILICATE SOLUTION AT A PRESSURE AND DIRECTION SUFFICIENT TO CREATE A WHIRLING MASS THEREOF, PASSING THE WHIRLING SOLUTION DOWNWARDLY THROUGH A CONFINED AREA IN SAID ZONE TO A MIXING CHAMBER HAVING A RESTRICTED DISCHARGE PORT, CONTACTING SAID SILICATE SOLUTION IN SAID CHAMBER WITH AN INTIMATE DISPERSION OF A FINELY DIVIDED STREAM OF A MINERAL ACID HAVING AN APPARENT PRESSURE OF AT LEAST 125 P.S.I.A. PRIOR TO SAID CONTACT, SAID CONTACT EFFECTING A UNIFORM WEIGHT FLOW DISTRIBUTION OF ACID WITH THE SILICATE SOLUTION AND CREATING EXTREME TURBULENCE WITHIN THE MIXING CHAMBER RESULTING IN AN APPARANT PRESSURE OF AT LEAST 250 P.S.I.A., AND COLLECTING THE HYDROSOL FORMED THEREBY WHICH PASSES THROUGH THE RESTRICTED DISCHARGE PORT OF THE MIXING CHAMBER.
Claim 2
Independent Claim
142 words
A METHOD OF PRODUCING A CLEAR HOMOGENEOUS SILICA HYDROSOL CONTAINING ABOUT 10-22% BY WEIGHT SILICA COMPRISING INTRODUCING TO AMIXING ZONE A STREAM OF ALKALI METAL SILICATE SOLUTION AT A PRESSURE AND DIRECTION SUFFICIENT TO CREATE A WHIRLING MASS THEREOF, PASSING THE WHIRLING SOLUTION DOWNWARDLY THROUGH A CONFINED AREA IN SAID ZONE TO A MIXING CHAMBER HAVING A RESTRICTED DISCHARGE PORT, CONTACTING SAID SILICATE SOLUTION IN SAID CHAMBER WITH AN INTIMATE DISPERSION OF A FINELY DIVIDED STREAM OF A MINERAL ACID HAVING AN APPARENT PRESSURE OF AT LEAST 125 P.S.I.A. PRIOR TO SAID CONTACT, SAID CONTACT EFFECTING A UNIFORM WEIGHT FLOW DISTRIBUTION OF ACID WITH THE SILICATE SOLUTION AND CREATING EXTREME TURBULENCE WITHIN THE MIXING CHAMBER RESULTING IN AN APPARANT PRESSURE OF AT LEAST 250 P.S.I.A., AND COLLECTING THE HYDROSOL FORMED THEREBY WHICH PASSES THROUGH THE RESTRICTED DISCHARGE PORT OF THE MIXING CHAMBER.
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) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |