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US3207699A
Expired / Lapsed
US
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Trimethylsilane treatment of dry calcined silica-alumina
Assignee: Air Products and Chemicals Inc
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Filing: 1961-05-04
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Granted: 1965-09-21
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 William A Harding
- 👤 Shalit Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:02
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; B; B01; B01J; B01J21/00; B01J21/16; C01B33/26; C01B33/40; C01B33/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF PREPARING A SILICA ALUMINA CRACKING CATALYST HAVING MODIFIED ACIDIC ACTIVITY WHICH CONSISTS ESSENTIALLY OF THE STEPS OF: PREPARING SILICA ALUMINA GRANULES HAVING CRACKING ACTIVITY; DRYING SAID GRANULES AT A TEMPERATURE GREATER THAN 400*C.; TREATING THE HOT DRIED GRANULES WITH THE VAPORS OF TRIMETHYLSILANE, WHEREBY HYDROGEN IS EVOLVED AND TRIMETHYLSILYL GROUPS ARE BONDED TO THE GRANULES; AND COOLING THE THUS TREATED GRANULES IN AN ATMOSPHERE CONTAINING NO OXYGEN, WHEREBY A CATALYST IS PREPARED COMPRISING TRIMETHYLSILYL GROUPS BONDED TO SILICA ALUMINA.
Claim 2
Independent Claim
82 words
THE METHOD OF PREPARING A SILICA ALUMINA CRACKING CATALYST HAVING MODIFIED ACIDIC ACTIVITY WHICH CONSISTS ESSENTIALLY OF THE STEPS OF: PREPARING SILICA ALUMINA GRANULES HAVING CRACKING ACTIVITY; DRYING SAID GRANULES AT A TEMPERATURE GREATER THAN 400*C.; TREATING THE HOT DRIED GRANULES WITH THE VAPORS OF TRIMETHYLSILANE, WHEREBY HYDROGEN IS EVOLVED AND TRIMETHYLSILYL GROUPS ARE BONDED TO THE GRANULES; AND COOLING THE THUS TREATED GRANULES IN AN ATMOSPHERE CONTAINING NO OXYGEN, WHEREBY A CATALYST IS PREPARED COMPRISING TRIMETHYLSILYL GROUPS BONDED TO SILICA 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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |