US3712856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallic catalyst and aluminum oxide containing supports from acid leached alloys
Assignee: Individual
•
Filing: 1970-12-02
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Granted: 1973-01-23
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Expires: 1990-12-02
Abstract
Abstract AN IMPROVED METALLIC CATALYST OF HIGH SURFACE AREA A PREPARED FROM AN ALLOY COMPRISING ALUMINUM AND A SECOND METAL WHICH IS SOLUBLE IN OXIDIZING ACIDS. THIS ALLOY IS CONTACTED WITH AN OXIDIZING ACID FOR A TIME PERIOD AND AT A TEMPERATURE AND ACID CONCENTRATION SUFFICIENT TO DISSOLVE A PORTION OF THE SECOND METAL. THE ALLOY IS SUBSEQUENTLY CONTACTED WITH AN ALKALI METAL HYDROXIDE UNDER CONDITIONS SUFFICIENT TO CONVERT THE ALUMINUM AT THE SURFACE OF THE ALLOY TI O ALUMINUM HYDROXIDE. THE ALLOY THUS TREATED IS THEN HEATED IN THE PRESENCE OF OXYGEN FOR A TIME PERIOD AND AT A TEMPERATURE SUFFICIENT TO CONVERT THE ALUMINUM HYDROXIDE TO ALUMINUM OXIDE.
Inventors
- 👤 E Betz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:27
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/62; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J23/70; B01J37/00; B01J37/06; B01J37/12; B01J23/76; B01J23/84; B01J23/889; B01J23/8892
Claims Analysis
Total Claims: 0
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |