US3582494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing alkaline salt-free aqueous colloidal sols
Assignee: ChampionX LLC
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Filing: 1968-03-27
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Granted: 1971-06-01
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Expires: 1988-03-27
Abstract
Abstract A METHOD OF PRODUCING AQUEUS COLLOIDAL ALKALINE SILICA SOLS FROM SALT-FREE ACIDIC AQUEOUS COLLOIDAL SOLS BY TREATING SUCH ACIDIC SOLS WITH AT LEAST 0.003% BY WEIGHT, BASED ON THE WEIGHT OF THE SILICA IN SUCH SOL, OF A SALT WHOSE ANION IS DERIVED FROM A WEAK ACID WHOSE IONIZATION CONSTANT SHOULD NOT EXCEED THAT OF CARBONIC ACID. AFTER THE ADDITION OF SALT, THE PH OF THE TREATED SOL IS ADJUSTED TO WITHIN THE RANGE 7.0-11.0.
Inventors
- 👤 Peter H Vossos
- 👤 Morris Mindick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/148; C01B33/1485
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |