US3752772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of catalyst from kaolin clay
Assignee: BASF Catalysts LLC
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Filing: 1971-06-25
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Granted: 1973-08-14
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Expires: 1991-06-25
Abstract
Abstract A MIXTURE OF HYDRATED KAOLIN CLAY AND CALCINED KAOLIN CLAY (METAKAOLIN FORM) OR PARTIALLY REHYDRATED METAKAOLIN IS FORMED INTO PARTICLES SUCH AS EXTRUDED PELLETS. THE PARTICLES ARE CALCINED AT ABOUT 1350*F. TO CONVERT THE HYDRATED CLAY INTO METAKAOLIN. THE PARTICLES ARE THEN IMMERSED IN WATER AND HEATED UNDER SUPERATMOSPHERIC PRESSURE TO PROVIDE A CRACKING CATALYST.
Inventors
- 👤 J Horzepa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:27
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01J37/10; B01J21/00; B01J21/12; B01J21/16; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |