Patent US1990822A successfully refreshed from Google Patents.
Patent US3554929A successfully refreshed from Google Patents.
US3554929A
Expired / Lapsed
US
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High surface area alumina coatings on catalyst supports
Assignee: EIDP Inc
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Filing: 1967-06-08
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Granted: 1971-01-12
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Expires: 1987-06-08
Abstract
Abstract CATALYST SUPPORTS HAVING LOW SURFACE AREA ARE COATED WITH AN AQUEOUS COLLOIDAL BOEHMITE-ACTIVATED ALUMINA COMPOSITION, DRIED, AND THEN CALCINED AT ABOUT 500*C., TO OBTAIN A HIGH SURFACE AREA COATING. THE COATING COMPOSITION CAN OPTIONALLY CONTAIN CATALYTIC MATERIAL OR THESE MATERIALS CAN BE SUBSEQUENTLY APPLIED TO FORM A COMPLETE CATALYST.
Inventors
- 👤 Ralph Aarons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:52
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |