US3560400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concentrating silica aquasols
Assignee: Monsanto Chemicals Ltd
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Filing: 1967-12-13
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Granted: 1971-02-02
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Expires: 1987-12-13
Abstract
Abstract PROCESS FOR THE PRODUCTION OF A CONCENTRATED SILICA AQUASOL, WHICH PROCESS COMPRISES THE REMOVAL OF WATER FROM A DILUTE SILICA AQUASOL W%HICH IS CONTAINED IN ONE COMPARTMENT WHICH IS SEPARATED FROM A SECOND COMPARTMENT BY A MEMBRANE WHICH IS PERMEABLE BY WATER MOLECULES BUT NOT BY THE COLLOIDAL PARTICLES OF SILICA. THE WATER TRANSFERS FROM SAID AQUASOL IN THE FIRST COMPARTMENT TO A LIQUID CONTAINED IN THE SECOND COMPARTMENT BY MEANS, FOR EXAMPLE, OF PRESSURE APPLIED TO THE AQUASOL. AN IMPROVEMENT IN THE THROUGHPUT IS ACHIEVED BY PRETREATING THE AQUASOL WITH ION-EXCHANGE RESINS TO REDUCE THE PH TO A VALUE OF FROM ABOUT 2 TO ABOUT 4.
Inventors
- 👤 Henry Thomas Joseph Chilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:10
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |