US3644472A
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Preparation of unsaturated aliphatic nitriles
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1968-07-25
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Granted: 1972-02-22
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Expires: 1988-07-25
Abstract
Abstract AN OLIFIN IS OXIDIZED IN THE PRESENCE OF AMMONOIA IN A FLUIDIZED CATALYTIC BED IN A REACTOR HAVING A SPECIFIC STRUCTURE OPERATING IN SPECIFIC CONDITIONS. THE STRUCTURE COMPRISES A PLURALITY OF HEAT-EXCHANGE TUBES VERTICALLY EXTENDING THROUGH THE CATALYTIC BED, THE TUBES COMPRISING EXTERNAL RIBS OF FINS SUBDIVING THE BED INTO A PLURALITY OF VERTICALLY EXTENDING INTERCOMMUNICATING COMPONENT BEDS IN WHICH A SPECIFIC "REAL" HEIGHT-TO-DIAMETER RATION IS ESTABLISHED IN OPERATION.
Inventors
- 👤 Teo Paleologo
- 👤 Luigi Lugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:52
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/26; B; B01; B01J; B01J8/00; B01J8/18; B01J8/1836; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/20; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |