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Patent US2915365A successfully refreshed from Google Patents.
US2915365A
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Method of preparing activated alumina from commercial alpha alumina trihydrate
Assignee: Pechiney SA
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Filing: 1955-06-20
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Granted: 1959-12-01
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Expires: 1975-06-20
Abstract
No abstract record available.
Inventors
- 👤 Saussol Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:08
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J21/00; B01J21/16; C; C01; C01F; C01F7/00; C01F7/02; C01F7/44; C01F7/441; C01F7/444; C01F7/445
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
PROCESS FOR TRANSFORMING ALPHA ALMINA TRIHYDRATE INTO ACTIVATED ALUMINA POSESSING A HIGH ADSORPTION POWER FOR WATER VAPOR RANGING FROM 9-15G. OF WATER PER 100G. OF ALUMINA, COMPRISING THE STEPS OF :CONTACTING THE TRIHYDRATE IN FINELY DIVIDED STATE WITH A STREAM OF HOT GASES AT A TEMPERATURE RANGING BETWEEN 400 AND 1000*C., MAINTAINING THE CONTACT BETWEEN THE TRIHYDRATE AND GASES FOR A TIME RANGING FROM A FRACTION OF A SECOND TO AN UPPER LIMIT OF ABOUT TEN SECONDS, AND THEREAFTER SEPARATING THE DEHYDRATED ALUMINA FROM THE HOT GASES.
Claim 2
Dependent Claim
87 words
PROCESS FOR TRANSFORMING ALPHA ALMINA TRIHYDRATE INTO ACTIVATED ALUMINA POSESSING A HIGH ADSORPTION POWER FOR WATER VAPOR RANGING FROM 9-15G. OF WATER PER 100G. OF ALUMINA, COMPRISING THE STEPS OF :CONTACTING THE TRIHYDRATE IN FINELY DIVIDED STATE WITH A STREAM OF HOT GASES AT A TEMPERATURE RANGING BETWEEN 400 AND 1000*C., MAINTAINING THE CONTACT BETWEEN THE TRIHYDRATE AND GASES FOR A TIME RANGING FROM A FRACTION OF A SECOND TO AN UPPER LIMIT OF ABOUT TEN SECONDS, AND THEREAFTER SEPARATING THE DEHYDRATED ALUMINA FROM THE HOT GASES.
References Cited (Backward Citations)
US1871793A
Cited
US1871792A
Cited
US2351091A
Cited
US2393766A
Cited
US2478675A
Cited
US2378155A
Cited
US2604379A
Cited
US2799558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |