US3703558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a pure hydrogenated cycloolefin
Assignee: Cities Service Co
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Filing: 1971-02-18
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Granted: 1972-11-21
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Expires: 1991-02-18
Abstract
Abstract A PROCESS IMPROVEMENT FOR PRODUCING HIGH PURITY CYCLODODECANE (CDA) FROM CYCLODODECATRIENE IS DISCLOSED WHEREIN AFTER THE CYCLODODECANE (AS THE HYDROGENATION ZONE REACTION PRODUCT) AND THE HYDROGENATION CATALYST IS FILTERED TO SEPARATE THE CATALYST AND PURIFY THE PRODUCT, THE CATALYST FILTER CAKE IS BACKFLUSHED WITH A VOLATILE LIQUID ALKANE TO THE HYDROGENATION ZONE. THE ALKANE IS THEN VOLATILIZED AND DISPLACED BY CYCLODODECATRINE FEED. RETAINED LIQUID ALKANE ON THE FILTER IS VACUUM FLUSHED.
Inventors
- 👤 Ralph Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:32
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/02; C07C13/273; C07C5/00; C07C5/02; C07C5/03; C07C7/00; C07C2601/00; C07C2601/18; C07C2601/20
Claims Analysis
Total Claims: 0
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |