US2915365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing activated alumina from commercial alpha alumina trihydrate
Assignee: Pechiney SA
•
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 06:59
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.
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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) | 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 |