US3050573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation
Assignee: Shell USA Inc
•
Filing: 1957-12-06
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Granted: 1962-08-21
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Expires: 1977-12-06
Abstract
No abstract record available.
Inventors
- 👤 Anderson Ralph
- 👤 Jr Carl H Deal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:47
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR THE EXTRACTIVE DISTILLATION OF ISOPRENE FROM A MIXTURE OF CLOSE BOILING, MORE SATURATED C5 HYDROCARBONS COMPRISING EXTRACTIVELY DISSTILLING THE MIXTURE IN THE PRESENCE OF DIMETHYL SULFOXIDE TO OBTAIN A FIRST EXTRACT PHASE CONTAINING DIMETHYL SULFOXIDE TO OBTAIN A FIRST EXTRACT DUCING SAID FIRST EXTRACT PHASE TO A LIQUID-LIQUID EXTRACTION WITH A C7 TO C10 PARAFFIN TO FORM A SECOND EXTRACT PHASE CONTAINING SAID PARAFFIN AND ISOPRENE, AND STRIPPING THE SECOND EXTRACT PHASE TO SEPARATE THE ISOPRENE FROM THE PARAFFIN.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE EXTRACTIVE DISTILLATION OF ISOPRENE FROM A MIXTURE OF CLOSE BOILING, MORE SATURATED C5 HYDROCARBONS COMPRISING EXTRACTIVELY DISSTILLING THE MIXTURE IN THE PRESENCE OF DIMETHYL SULFOXIDE TO OBTAIN A FIRST EXTRACT PHASE CONTAINING DIMETHYL SULFOXIDE TO OBTAIN A FIRST EXTRACT DUCING SAID FIRST EXTRACT PHASE TO A LIQUID-LIQUID EXTRACTION WITH A C7 TO C10 PARAFFIN TO FORM A SECOND EXTRACT PHASE CONTAINING SAID PARAFFIN AND ISOPRENE, AND STRIPPING THE SECOND EXTRACT PHASE TO SEPARATE THE ISOPRENE FROM THE PARAFFIN.
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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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |