US3301915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of isoprene from hydrocarbon fractions
Assignee: International Synthetic Rubber Co Ltd
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Filing: 1965-11-05
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Granted: 1967-01-31
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Expires: 1985-11-05
Abstract
No abstract record available.
Inventors
- 👤 King Ralph William
- 👤 Shorthouse Barry Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/005; C07C7/148; C07C7/177
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR THE RECOVERY OF AN ISOPRENE FRACTION WITH A VERY LOW CYCLOPENTADIENE CONTENT AS AN OVERHEAD FRACTION BY FRACTIONAL DISTILLATION FROM A HYDROCARBON STREAM CONTAINING ISOPRENED AND CYCLOPENTADIENE AND CONSISTING PREDOMINANTLY OF C5 HYDROCARBONS IN WHICH PROCESS LIQUID IS WITHDRAWM DURING THE COURSE OF THE FRACTIONAL DISTILLATION FROM AN INTERMEDIATE POINT IN THE FRACTIONAL DISTILLATION SYSTEM IN AN AREA OF RELATIVELY HIGH CYCLOPENTADIENE CONCENTRATION, THE WITHDRAWN LIQUID IS SUBJECTED TO DIMERISATION CONDITIONS FOR THE DIMERISATION OF CYCLOPENTADIENE AND THE RESULTING LIQUID PRODUCT IS RETURNED TO AN INTERMIEDCIATE POINT IN THE FRACTIONAL DISTILLATION SYSTEM.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE RECOVERY OF AN ISOPRENE FRACTION WITH A VERY LOW CYCLOPENTADIENE CONTENT AS AN OVERHEAD FRACTION BY FRACTIONAL DISTILLATION FROM A HYDROCARBON STREAM CONTAINING ISOPRENED AND CYCLOPENTADIENE AND CONSISTING PREDOMINANTLY OF C5 HYDROCARBONS IN WHICH PROCESS LIQUID IS WITHDRAWM DURING THE COURSE OF THE FRACTIONAL DISTILLATION FROM AN INTERMEDIATE POINT IN THE FRACTIONAL DISTILLATION SYSTEM IN AN AREA OF RELATIVELY HIGH CYCLOPENTADIENE CONCENTRATION, THE WITHDRAWN LIQUID IS SUBJECTED TO DIMERISATION CONDITIONS FOR THE DIMERISATION OF CYCLOPENTADIENE AND THE RESULTING LIQUID PRODUCT IS RETURNED TO AN INTERMIEDCIATE POINT IN THE FRACTIONAL DISTILLATION SYSTEM.
References Cited (Backward Citations)
US2704778A
Cited
US2768224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |