US3790550A
Expired / Lapsed
US
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Fluid bed polymerization process
Assignee: Union Carbide Corp
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Filing: 1971-10-26
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Granted: 1974-02-05
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Expires: 1991-10-26
Abstract
Abstract POLYMERIZATION CATALYSTS IN THE FORM OF DRY POWDERS ARE CONTINUOUSLY FED TO A FLUIDIZED BED REACTOR UNDER ESSENTIALLY PLUG-FOLW CONDITIONS BY A SEQUENTIAL REPETITION OF THE STEPS OF DISPENSING UNDER CONTROLLED CONDITIONS, A DESIRED QUANTITY OF CATALYST FROM A CATALYST SUPPLY SOURCE TO A CHAMBER WHICH IS ALTERNATELY COMMUNICABLE WITH SUCH SUPPLY SOURCE AND THE REACTION ZONE OF THE FLUIDIZED BED REACTOR, ISOLATING THE DISPENSED CATALYST FROM THE CATALYST SUPPLY SOURCE, EXPOSING THE DISPENSED CATALYST FROM THE THE REACTION ZONE OF THE FLUIDIZED BED REACTOR AND RAPIDLY INJECTING THE CATALYST INTO THE REACTION ZONE WITH A CARRIER GAS.
Inventors
- 👤 A Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1818; B01J8/1827; B01J8/0015; B01J8/0035; B01J8/24; B01J8/32; C; C08; C08F; C08F10/00; B01J2208/00; B01J2208/00743; B01J2208/00752; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/908
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |