US3947376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica sols containing large particle size silica
Assignee: ChampionX LLC
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Filing: 1971-05-12
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Granted: 1976-03-30
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Expires: 1991-05-12
Abstract
Abstract There is disclosed a concentrated stable alkaline silica sol having a pH of from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles having a weight-average particle diameter of about 45 to about 100 millimicrons and water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25 DEG C. and a specific conductance of less than 5000 micromhos/cm.
Inventors
- 👤 William L. Albrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:09
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/151
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles expressed as SiO 2 having a weight-average particle diameter of about 45 to about 100 millimicrons and the water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25° C. and a specific conductance of less than 5,000 micromhos/cm.
Claim 2
Dependent Claim
84 words
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles expressed as SiO 2 having a weight-average particle diameter of about 45 to about 100 millimicrons and the water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25° C. and a specific conductance of less than 5,000 micromhos/cm.
Claim 3
Dependent Claim
20 words
A stable alkaline silica sol of claim 1 wherein the silica particles have a weight-average particle diameter of 45-80 millimicrons.
Claim 4
Dependent Claim
81 words
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35-55% by weight of uniform, non-aggregated silica particles, expressed as SiO 2 , having a weight-average particle diameter from about 45 to about 70 millimicrons and water as a hydrophilic liquid carrier of said silica particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25° C. and a specific conductance of less than 5000 micromhos/cm.
Claim 5
Dependent Claim
81 words
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35-55% by weight of uniform, non-aggregated silica particles, expressed as SiO 2 , having a weight-average particle diameter from about 45 to about 70 millimicrons and water as a hydrophilic liquid carrier of said silica particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25° C. and a specific conductance of less than 5000 micromhos/cm.
Claim 6
Dependent Claim
19 words
The alkaline silica sol of claim 3 wherein the pH of said sol is from 7.5 to 10.0 units.
References Cited (Backward Citations)
US2577485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |