US3576768A
Expired / Lapsed
US
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Novel alumina hydrate, a novel alumina obtained from the alumina hydrate, a catalyst containing the novel alumina and the method of preparing the same
Assignee: Gulf Research and Development Co
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Filing: 1969-10-29
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Granted: 1971-04-27
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Expires: 1989-10-29
Abstract
Abstract A NOVEL ALUMINA HYDRATE OBTAINED BY HYDROTHERMALLY TREATING A CRYSTALLINE ALUMINA HYDRATE CONTAINING FROM 1.2 TO 2.6 MOLS OF WATER OF HYDRATION. THE HYDROTHERMAL TREATMENT IS CONDUCTED BY HEATING THE CRYSTALLINE ALUMINA HYDRATE IN THE PRESENCE OF WATER AT A TEMPERATURE IN THE RANGE FROM 225* TO 700*F. AND SUFFICIENT TO VAPORIZE THE WATER UNDER AUTOGENOUS PRESSURE AND THEREAFTER DRYING THE HYDROTHERMALLY TREATED CRYSTALLINE ALUMINA HYDRATE. A NOVEL ALUMINA IS OBTAINED FROM THE HYDROTHERMALLY TREATED ALUMINA HYDRATE BY CALCINING SUCH MATERIAL.
Inventors
- 👤 William L Kehl
- 👤 Meredith M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:50
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J21/00; B01J21/02; B01J21/04; B01J35/00; B01J35/60; B01J37/00; B01J37/08; B01J37/10; C07; C07C; C07C5/00; C07C5/02; C07C5/10; B01J35/61; B01J35/615; B01J35/63; B01J35/633; B01J35/64; B01J35/647; C01P; C01P2006/00; C01P2006/11; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/17; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/38; C07C2523/40; C07C2523/70; C07C2523/74
Claims Analysis
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |