US2788378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal and recovery of impurities from diolefin streams
Assignee: Polysar Ltd
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Filing: 1952-05-02
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Granted: 1957-04-09
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Expires: 1972-05-02
Abstract
No abstract record available.
Inventors
- 👤 Cotton William Stanley
- 👤 Kupa Peter Constantine
- 👤 Taylor Grant William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:35
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN THE PROCESS OF DIOLEFIN EXTRACTION BY MEANS OF A CUPROUS AMMONIUM ACETATE SOLVENT, THE STEPS OF INTIMATELY CONTACTING A DILUTE DIOLEFIN STREAM WITH A STREAM OF SOLVENT IN A RATIO OF BETWEEN ABOUT 5:1 TO 10:1 BY WEIGHT OF HYDROCARBON STREAM TO SOLVENT BEFORE THE DILUTE DIOLEFIN STREAM COMES IN CONTACT WITH THE MAIN BODY OF THE SOLVENT IN AN EXTRACTION UNIT, THEREBY DISSOLVING A RELATIVELY SMALL PORTION OF THE SAID DIOLEFIN PRESENT IN SUCH DILUTE STREAM, AND VIRTUALLY ALL OF THE COMPONENTS OF THE SAID DILUTE STREAM WHICH ARE MORE SOLUBLE IN THE SOLVENT THAN IS THE SAID DIOLEFIN, SEPARATING A HYDROCARBON STREAM FROM THE RICH SOLVENT, THENCE RECOVERING THE DISSOLVED DIOLEFIN AND OTHER COMPONENTS FROM THE SOLVENT IN SEPARATE RELATIVELY PURE STREAMS IN A SERIES OF STRIPPING STEPS, AND RECYCLING THE LEAN SOLVENT BACK TO THE DILUTE STREAM.
Claim 2
Dependent Claim
141 words
IN THE PROCESS OF DIOLEFIN EXTRACTION BY MEANS OF A CUPROUS AMMONIUM ACETATE SOLVENT, THE STEPS OF INTIMATELY CONTACTING A DILUTE DIOLEFIN STREAM WITH A STREAM OF SOLVENT IN A RATIO OF BETWEEN ABOUT 5:1 TO 10:1 BY WEIGHT OF HYDROCARBON STREAM TO SOLVENT BEFORE THE DILUTE DIOLEFIN STREAM COMES IN CONTACT WITH THE MAIN BODY OF THE SOLVENT IN AN EXTRACTION UNIT, THEREBY DISSOLVING A RELATIVELY SMALL PORTION OF THE SAID DIOLEFIN PRESENT IN SUCH DILUTE STREAM, AND VIRTUALLY ALL OF THE COMPONENTS OF THE SAID DILUTE STREAM WHICH ARE MORE SOLUBLE IN THE SOLVENT THAN IS THE SAID DIOLEFIN, SEPARATING A HYDROCARBON STREAM FROM THE RICH SOLVENT, THENCE RECOVERING THE DISSOLVED DIOLEFIN AND OTHER COMPONENTS FROM THE SOLVENT IN SEPARATE RELATIVELY PURE STREAMS IN A SERIES OF STRIPPING STEPS, AND RECYCLING THE LEAN SOLVENT BACK TO THE DILUTE STREAM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |