US3213038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon cracking catalyst obtained by acid treating kaolin and adding magnesia
Assignee: Wyeth Holdings LLC
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Filing: 1963-08-01
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Granted: 1965-10-19
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Expires: 1983-08-01
Abstract
No abstract record available.
Inventors
- 👤 Chomitz Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:09
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; B01J21/10; B01J21/12; B01J23/00; B01J23/02; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A PROCESS FOR PREPARING A MAGNESIA CONTAINING SISLICA CATALYST WHICH COMPRISES (1) DIGESTING KAOLIN WITH ACID SO AS TO REMOVE THEREFROM AT LEAST ABOUT 85% OF THE ALUMINA CONTENT THEREOF, (2) SEPARATING THE RESIDUE RESULTING FROM SAID DIGESTING WITH ACID, (3) REACTING (A) SAID RESIDUE WITH (B) MAGNESIA HAVING A SURFACE AREA OF FROM ABOUT 10 TO ABOUT 30 M.2/G. IN AN AMOUNT SUFFICIENT TO FORM A MAGNESIA CONTAINING SILICA COMPOSITE CONTAINING FROM ABOUT 15% TO ABOUT 35% OF SAID MAGNESIA, (4) DRYING AND CALCINING SAID COMPOSITE.
References Cited (Backward Citations)
US2611738A
Cited
US3116973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |