Patent US3705204A successfully refreshed from Google Patents.
US3705204A
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US
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Process for recovering conjugated diolefins selectively from a c5 fraction
Assignee: Eneos Corp
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Filing: 1970-08-07
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Granted: 1972-12-05
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Expires: 1990-08-07
Abstract
Abstract A PROCESS FOR RECOVERING USEFUL CONJUGATED DIOLEFINS SELECTIVELY AND EFFICIENTLY FROM A C5 FRACTION OBTAINED BY CRACKING OF HYDROCARBONS BY A COMBINATION OF STEPS OF A HEAT TREATMENT OF THE STARTING C5 FRACTION UNDER RELATIVELY MILD CONDITIONS, DIVISION OF THUS HEAT-TREATED FRACTION INTO SUBSTANTIALLY THREE FRACTIONS IN A FRACTIONATOR, I.E. FIRST, SECOND AND THIRD FRACTIONS, AND RECYCLING OF SAID SECOND FRACTION TO THE STARTING HEAT TREATMENT STEP.
Inventors
- 👤 Tatsuo Horie
- 👤 Syunichi Yamamoto
- 👤 Shinji Gotoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:24
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |