Patent US2952671A successfully refreshed from Google Patents.
US2952671A
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Recovery of olefin polymers from solution
Assignee: —
•
Filing: —
•
Granted: 1960-09-13
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Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:11
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F6/00; C08F6/06; C08F6/12; C08F110/00; C08F110/02; C08F2/00; C08F2/12; C08F2/14; C08F6/001; C08F6/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR RECOVERING AN OLEFIN POLYMER IN SOLID FORM FROM A SOLUTION THEREOF IN A PLURALITY OF PRECIPITATION ZONES IN CYCLIC OPERATION, COMPRISING, INTRODUCING DAID SOLUTION INTO ONE OF SAID PRECIPITATION ZONES, REDUCING THE PRESSURE IN SAID PRECIPITATION ZONE TO PRODUCE AUTOREFRIGERATION, THE RATE OF PRESSURE REDUCTION BEING CONTROLLED TO PROVIDE A SUBSTANTIALLY UNIFORM RATE OR TEMPERATURE DECREASE, STOPPING THE PRESSURE REDUCTION AFTER A PORTION OF THE POLYMER HAS PRECIPITATED, REMOVING THE RESULTING MIXTURE OF PRECIPATED POLYMER AND SOLVENT FROM THE PRECIPITATION ZONE, SEPARATING PREFIPITATED POLYMER FROM THE SOLUTION, AND RECYCLING THE SOLUTION SEPARATED FROM THE SOLID POLYMER CONTAINING POLYMER DISSOLVED THEREIN DIRECTLY TO THE PRECIPITATION ZONE WHEREBY SUBSTANTIALLY ALL THE POLYMER IS ULITMATELY PRECIPATED FROM THE SOLUTION.
Claim 2
Dependent Claim
119 words
A PROCESS FOR RECOVERING AN OLEFIN POLYMER IN SOLID FORM FROM A SOLUTION THEREOF IN A PLURALITY OF PRECIPITATION ZONES IN CYCLIC OPERATION, COMPRISING, INTRODUCING DAID SOLUTION INTO ONE OF SAID PRECIPITATION ZONES, REDUCING THE PRESSURE IN SAID PRECIPITATION ZONE TO PRODUCE AUTOREFRIGERATION, THE RATE OF PRESSURE REDUCTION BEING CONTROLLED TO PROVIDE A SUBSTANTIALLY UNIFORM RATE OR TEMPERATURE DECREASE, STOPPING THE PRESSURE REDUCTION AFTER A PORTION OF THE POLYMER HAS PRECIPITATED, REMOVING THE RESULTING MIXTURE OF PRECIPATED POLYMER AND SOLVENT FROM THE PRECIPITATION ZONE, SEPARATING PREFIPITATED POLYMER FROM THE SOLUTION, AND RECYCLING THE SOLUTION SEPARATED FROM THE SOLID POLYMER CONTAINING POLYMER DISSOLVED THEREIN DIRECTLY TO THE PRECIPITATION ZONE WHEREBY SUBSTANTIALLY ALL THE POLYMER IS ULITMATELY PRECIPATED FROM THE SOLUTION.
References Cited (Backward Citations)
US2731452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |