US3598877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclodiolefin hydrogenation
Assignee: Shell USA Inc
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Filing: 1970-06-05
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Granted: 1971-08-10
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Expires: 1990-06-05
Abstract
Abstract CYCLOPENTENE IN THE PRESENCE OF AN HYDROGENATION CATALYST, SUCH AS SULFIDED NICKEL OXIDE. DICYCLOPENTADIENE IS DEPOLYMERIZED TO MONOMERIC CYCYOPENTADIENE, AND THE MONOMER SELECTIVELY HYDROGENATED TO CYCLOPENTENE WITH HIGH OVERALL SELECTIVITY BY THERMALLY DEPOLYMERIZING THE DICYCLOPENTADIENE IN ADMIXTURE WITH HYDROGEN AND AN HYDROCARBON DILUENT AT A SUFFICIENTLY HIGH PRESSURE TO ALLOW INTRODUCTION OF THE CRACKED PRODUCTS DIRECTLY INTO THE HYDROGENATION REACTOR, AND THEN SELECTIVELY HYDROGENATING THE CYCLOPENTADIENE TO
Inventors
- 👤 Eugene B Fountain
- 👤 Durga S Ambwani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:17
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/02; C07C13/08; C07C13/12; C07C4/00; C07C4/22; C07C5/00; C07C5/02; C07C5/03; C07C5/05; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/755; C07C2527/00; C07C2527/02; C07C2527/04; C07C2527/043; C07C2601/00; C07C2601/06; C07C2601/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |