Patent US3296240A successfully refreshed from Google Patents.
US3296240A
Expired / Lapsed
US
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Recovery of alpha-olefin polymers from solution
Assignee: Dow Chemical Co
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Filing: 1963-05-03
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Granted: 1967-01-03
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Expires: 1983-05-03
Abstract
No abstract record available.
Inventors
- 👤 Stephen R Macdonald
- 👤 Robert L Dostal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:31
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/12; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
CONTINUOUS PROCESS FOR RECOVER OF SOLVENT-SOLUBLE A-OLEFIN POLYMERS FROM THE SOLUTION THEREOF IN VOLATILE LIQUID SOLVENTS THEREFOR BY INTRODUCING A SOLUTION OF AN A-OLEFIN POLYMER IN A VOLATILE LIQUID SOLVENT THEREFOR BY SPRAYING THE SAME INTO A STRIPPING ZONE DEFINED BY SOLID WALL SURFACES, SPRAYING STEAM INTO THE STRIPPING ZONE IN FLOW COUNTERCURRENT TO THE FLOW OF THE POLYMER SOLUTION, INTRODUCING INTO THE STRIPPING ZONE AND FLOWING OVER THE INTERIOR SURFACES OF THE WALLS DEFINING SAID ZONE A NONSOLVENT LIQUID WHICH IS IMMISCIBLE WITH EITHER THE POLYMER OR THE SOLVENT CONTAINED IN THE STARTING POLYMER SOLUTION, CONTACTING THE SOLUTION OF THE SOLVENT-SOLUBLE POLYMER IN SOLVENT THEREFOR WITH THE STEAM TO VOLATILIIZE THE SOLVENT AND PRECIPITATE THE POLYMER, WITHDRAWING A MIXTURE OF STEAM AND VAPORS OF THE SOLVENT FROM THE STRIPPING ZONE,
Claim 2
Dependent Claim
131 words
CONTINUOUS PROCESS FOR RECOVER OF SOLVENT-SOLUBLE A-OLEFIN POLYMERS FROM THE SOLUTION THEREOF IN VOLATILE LIQUID SOLVENTS THEREFOR BY INTRODUCING A SOLUTION OF AN A-OLEFIN POLYMER IN A VOLATILE LIQUID SOLVENT THEREFOR BY SPRAYING THE SAME INTO A STRIPPING ZONE DEFINED BY SOLID WALL SURFACES, SPRAYING STEAM INTO THE STRIPPING ZONE IN FLOW COUNTERCURRENT TO THE FLOW OF THE POLYMER SOLUTION, INTRODUCING INTO THE STRIPPING ZONE AND FLOWING OVER THE INTERIOR SURFACES OF THE WALLS DEFINING SAID ZONE A NONSOLVENT LIQUID WHICH IS IMMISCIBLE WITH EITHER THE POLYMER OR THE SOLVENT CONTAINED IN THE STARTING POLYMER SOLUTION, CONTACTING THE SOLUTION OF THE SOLVENT-SOLUBLE POLYMER IN SOLVENT THEREFOR WITH THE STEAM TO VOLATILIIZE THE SOLVENT AND PRECIPITATE THE POLYMER, WITHDRAWING A MIXTURE OF STEAM AND VAPORS OF THE SOLVENT FROM THE STRIPPING ZONE,
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |