Patent US2960549A successfully refreshed from Google Patents.
US2960549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer removal
Assignee: Polysar Ltd
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Filing: 1959-04-06
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Granted: 1960-11-15
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Expires: 1979-04-06
Abstract
No abstract record available.
Inventors
- 👤 Finigan Charles Milne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:20
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
IN A PROCESS FOR THE SEPARATION OF A CONJUGATED DIOLEFIN HAVING 4 CARBON ATOMS IN THE UNSATURATED CARBON CHAIN FROM A HYDROCARBON MIXTURE CONTAINING OTHER HYDROCARBONS INCLUDING ACETYLENES WHICH COMPRISES CONTACTING SAID MIXTURE IN AN ABSORPTION STAGE WITH A CUPROUS AMMONIACAL SALT SOLVENT WHEREBY THE CONJUGATED DIOLEFIN AND ACETYLENES ARE ABSORBED BY THE SOLVENT, PASSING THE SOLVENT CONTAINING ABSORBED BY THE SOLVENT, PASSING THE SOLVENT WHERE THE CONJUGATED DIOLEFIN AND SOME ACETYLENES ARE STRIPPED FROM THE SOLVENT AND RETURNING THE STRIPPED SOLVENT, CONTAINING ACETYLENIC POLYMERS FORMED DURING THE ABSORPTION AND DESORPTION STAGES TO THE ABSORPTION STAGE, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE STRIPPED SOLVENT CONTAINING ACETYLENE POLYMERS WITH A LIQUID HYDROCARBON COMPRISING AT LEAST 60 MOL PERCENT CONJUGATED DIOLEFIN HAVING 4 CARBON ATOMS IN THE UNSATURATED CARBON CHAIN WHEREBY TO EXTRACT SAID ACETYLENIC POLYMERIC BEFORE THE STRIPPED SOLVENT IS RETURNED TO THE ABSORPTION STAGE, THE EXTRACTION OPERATION BEING CARRIED OUT AT A TEMPERATURE AOVE 25*C. AND THE WEIGHT RATIO OF SAID STRIPPED SOLVENT TO SAID LIQUID HYDROCARBON BEING BETWEEN ABOUT 10:1 AND 1:1.
Claim 2
Dependent Claim
173 words
IN A PROCESS FOR THE SEPARATION OF A CONJUGATED DIOLEFIN HAVING 4 CARBON ATOMS IN THE UNSATURATED CARBON CHAIN FROM A HYDROCARBON MIXTURE CONTAINING OTHER HYDROCARBONS INCLUDING ACETYLENES WHICH COMPRISES CONTACTING SAID MIXTURE IN AN ABSORPTION STAGE WITH A CUPROUS AMMONIACAL SALT SOLVENT WHEREBY THE CONJUGATED DIOLEFIN AND ACETYLENES ARE ABSORBED BY THE SOLVENT, PASSING THE SOLVENT CONTAINING ABSORBED BY THE SOLVENT, PASSING THE SOLVENT WHERE THE CONJUGATED DIOLEFIN AND SOME ACETYLENES ARE STRIPPED FROM THE SOLVENT AND RETURNING THE STRIPPED SOLVENT, CONTAINING ACETYLENIC POLYMERS FORMED DURING THE ABSORPTION AND DESORPTION STAGES TO THE ABSORPTION STAGE, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE STRIPPED SOLVENT CONTAINING ACETYLENE POLYMERS WITH A LIQUID HYDROCARBON COMPRISING AT LEAST 60 MOL PERCENT CONJUGATED DIOLEFIN HAVING 4 CARBON ATOMS IN THE UNSATURATED CARBON CHAIN WHEREBY TO EXTRACT SAID ACETYLENIC POLYMERIC BEFORE THE STRIPPED SOLVENT IS RETURNED TO THE ABSORPTION STAGE, THE EXTRACTION OPERATION BEING CARRIED OUT AT A TEMPERATURE AOVE 25*C. AND THE WEIGHT RATIO OF SAID STRIPPED SOLVENT TO SAID LIQUID HYDROCARBON BEING BETWEEN ABOUT 10:1 AND 1:1.
References Cited (Backward Citations)
US2390764A
Cited
US2472487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |