US3784626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of conjugated diolefins from mixtures containing them
Assignee: SnamProgetti SpA
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Filing: 1971-12-29
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Granted: 1974-01-08
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Expires: 1991-12-29
Abstract
Abstract A PROCESS IS DISCLOSED WHEREBY CONJUGATED DIOLEFINS, SUCH AS ISOPRENE AND BUTADIENE, ARE SEPARATED WITH HIGH SELECTIVELY FROM MIXTURES CONTAINING THEM THROUGH EXTRACTION AND/OR EXTRACTIVE DISTILLATION WITH THE AID OF AN AGENT CONSISTING OF MORPHOLINE AND ANOTHER SOLVENT SUCH AS AN OXYGEN CONTAINING DERIVATIVE OF MORPHOLINE AND WATER, E.G., MORPHOLINE-WATER, MORPHOLINE-N-FORMYL MORPHOLINE AND MORPHOLINE-N-FORMYL MORPHOLINE-WATER.
Inventors
- 👤 A Ginnasi
- 👤 C Rescalli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C7/10
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |