US2862278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing improved catalysts moulded into pieces or carriers therefor
Assignee: Shell Development Co
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Filing: 1954-07-21
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Granted: 1958-12-02
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Expires: 1974-07-21
Abstract
No abstract record available.
Inventors
- 👤 Engel Willem Frederik
- 👤 Krijger Pieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:00
CPC Classifications
B; B01; B01J; B01J37/00; B01J21/00; B01J21/02; B01J21/04; B01J37/0009; Y; Y10; Y10S; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN THE PRODUCTION OF MICRO-POROUS PRESSED CATALYST PELLETS BY EXTRUSION OF A MOIST POWDERED ALUMINA THE COMBINATION OF STEPS WHICH COMPRISES DRYING THE CUT GREEN EXTRUDED STICKY PELLETS SUPERFICIALLY AND ONLY TO THE EXTENT NECESSARY TO PREVENT THEM FROM STICKING TOGETHER UPON TUMBLING, TUMBLING THE SUPERFICIALLY DRIED BUT STILL PLASTIC PELLETS ONLY TO THE EXTENT TO REMOVE THE SHARP EDGES, AGING THE TUMBLED PELLETS IN LAYERS LESS THAN ABOUT 5 CM. DEEP FOR A TIME OF AT LEAST 2 HOURS AT ABOUT ROOM TEMPERATURE AND AMBIENT HUMIDITY, WHEREBY SUBSTANTIALLY NO CHANGE IN WATER CONTENT OCCURS AND INTERNAL STRESSES ARE RELIEVED, AND THEN DRYING AND CALCINING THE PELLETS AT A TEMPERATURE OF ABOUT 500*C. TO PRODUCE PELLETS HAVING A MICRO-POROUS STRUCTURE AND HAVING NONE OF THE ALUMINA ORIGINALLY PRESENT THEREIN CONVERTED TO ALPHA ALUMINA.
Claim 2
Dependent Claim
133 words
IN THE PRODUCTION OF MICRO-POROUS PRESSED CATALYST PELLETS BY EXTRUSION OF A MOIST POWDERED ALUMINA THE COMBINATION OF STEPS WHICH COMPRISES DRYING THE CUT GREEN EXTRUDED STICKY PELLETS SUPERFICIALLY AND ONLY TO THE EXTENT NECESSARY TO PREVENT THEM FROM STICKING TOGETHER UPON TUMBLING, TUMBLING THE SUPERFICIALLY DRIED BUT STILL PLASTIC PELLETS ONLY TO THE EXTENT TO REMOVE THE SHARP EDGES, AGING THE TUMBLED PELLETS IN LAYERS LESS THAN ABOUT 5 CM. DEEP FOR A TIME OF AT LEAST 2 HOURS AT ABOUT ROOM TEMPERATURE AND AMBIENT HUMIDITY, WHEREBY SUBSTANTIALLY NO CHANGE IN WATER CONTENT OCCURS AND INTERNAL STRESSES ARE RELIEVED, AND THEN DRYING AND CALCINING THE PELLETS AT A TEMPERATURE OF ABOUT 500*C. TO PRODUCE PELLETS HAVING A MICRO-POROUS STRUCTURE AND HAVING NONE OF THE ALUMINA ORIGINALLY PRESENT THEREIN CONVERTED TO ALPHA ALUMINA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |