Patent US3674521A successfully refreshed from Google Patents.
US3674521A
Expired / Lapsed
US
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Clay
Assignee: Imerys Minerals Ltd
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Filing: 1970-05-05
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Granted: 1972-07-04
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Expires: 1990-05-05
Abstract
Abstract THE INVENTION CONCERNS A METHOF OF TREATING A RAW KAOLINITIC CLAY IN ORDER TO IMPROVE THE RHEOLOGICAL PROPERTIES THEREOF. THE RAW KAOLINITIC CLAY IS SATURATED OR SUBSTANTIALLY SATURATED WITH CATIONS SELECTED FROM THE GROUP CONSISTING OF LITHIUM IONS, MAGNESIUM IONS AND SODIUM IONS, AND IS THEN HEATED TO A TEMPERATURE IN THE RANGE OF FROM 200* C. TO 450* C. THE CLAY IS WASHED WITH AN AQUEOUS WASHING MEDIUM AFTER IT HAS BEEN SATURATED OR SUBSTANTIALLY SATURATED WITH SAID CATIONS AND EITHER BEFORE OR AFTER SAID HEATING.
Inventors
- 👤 Frank Raymond Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:02
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C04B33/30; Y; Y10; Y10S; Y10S264/00; Y10S264/39
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |