US2876068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of activated alumina
Assignee: Pechiney SA
•
Filing: 1955-06-02
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Granted: 1959-03-03
•
Expires: 1975-06-02
Abstract
No abstract record available.
Inventors
- 👤 Tertian Robert
- 👤 Papee Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:47
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; C; C01; C01F; C01F7/00; C01F7/02; C01F7/44; C01F7/441; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR OBTAINING ACTIVATED ALUMINA OF IMPROVED ACTIVITY FROM ALPHA ALUMINA TRIHYDRATE PRECIPITATED IN THE BAYER PROCESS WHICH CONSISTS ESSENTIALLY ONLY IN CRUSHING THE PARTICLES OF SAID ALUMINA TRIHYDRATE TO A SIZE BELOW 2 MICRONS AND HEATING THE CRUSHED PRODUCT UNDER ACTIVATING CONDITIONS UNTIL AN ACTIVATED PRODUCT IS OBTAINED.
Claim 2
Dependent Claim
50 words
A PROCESS FOR OBTAINING ACTIVATED ALUMINA OF IMPROVED ACTIVITY FROM ALPHA ALUMINA TRIHYDRATE PRECIPITATED IN THE BAYER PROCESS WHICH CONSISTS ESSENTIALLY ONLY IN CRUSHING THE PARTICLES OF SAID ALUMINA TRIHYDRATE TO A SIZE BELOW 2 MICRONS AND HEATING THE CRUSHED PRODUCT UNDER ACTIVATING CONDITIONS UNTIL AN ACTIVATED PRODUCT IS OBTAINED.
References Cited (Backward Citations)
US1972188A
Cited
US2499675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |