Patent US3567645A successfully refreshed from Google Patents.
US3567645A
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Silica desiccants and method of manufacture
Assignee: Kali Chemie AG
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Filing: 1965-11-23
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Granted: 1971-03-02
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Expires: 1985-11-23
Abstract
Abstract A PROCESS FOR MANUFACTURING SILICA GEL ESICCANTS HAVING HIGH RESISTANCE TO WATER, HIGH ATTRITION RESISTANCE, AND HIGH DRYING CAPACITY, WHICH COMPRISES MAKING A HYDROSOL, FORM ING A HYDROGEL THERFROM, COOLING AND AGING THE HYDROGEL WASHING AND DRYING IT, AND CALCINATING THE RESULTING SILICA GEL AT A TEMPERATURE BETWEEN ABOUT 300 TO 450*C. THE SILICA GEL DESICCANTS OF HIGH RESISTANCE TO WATER, HIGH DESICCANT AND HIGH ATTRITION RESISTANCE.
Inventors
- 👤 Juergen Dultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:11
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |