Patent US2992976A successfully refreshed from Google Patents.
US2992976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer recovery from solution
Assignee: —
•
Filing: —
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Granted: 1961-07-18
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:40
CPC Classifications
—
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN A PROCESS FOR THE RECOVERY OF SOLVENT FROM A SOLUTION OF NORMALLY SOLID POLYMER, SAID POLYMER SOLUTION BEING OF VARIABLE VISCOSITY, IN WHICH SAID SOLUTION IS FRACTIONATED IN A ZONE TO WHICH HEAT IS SUPPLIED BY INDIRECT HEAT EXCHANGE WITH CONCENTRATED POLYMER SOLUTION, IN WHICH SOLVENT IS WITHDRAWN FROM THE FRACTIONATION ZONE AS ONE PRODUCT AND CONCENTRATED POLYMER SOLUTION AS ANOTHER PRODUCT, THE IMPROVEMENT WHICH COMPRISES VARYING THE RATE OF HEAT INPUT TO SAID ZONE IN DIRECT PROPORTION TO AND IN RESPONSE TO CHANGES IN THE VOLUME OF CONCENTRATED POLYMER SOLUTION PRESENT THEREIN AND VARYING THE RATE OF WITHDRAWAL OF THE CONCENTRATED POLYMER SO-
Claim 2
Dependent Claim
105 words
IN A PROCESS FOR THE RECOVERY OF SOLVENT FROM A SOLUTION OF NORMALLY SOLID POLYMER, SAID POLYMER SOLUTION BEING OF VARIABLE VISCOSITY, IN WHICH SAID SOLUTION IS FRACTIONATED IN A ZONE TO WHICH HEAT IS SUPPLIED BY INDIRECT HEAT EXCHANGE WITH CONCENTRATED POLYMER SOLUTION, IN WHICH SOLVENT IS WITHDRAWN FROM THE FRACTIONATION ZONE AS ONE PRODUCT AND CONCENTRATED POLYMER SOLUTION AS ANOTHER PRODUCT, THE IMPROVEMENT WHICH COMPRISES VARYING THE RATE OF HEAT INPUT TO SAID ZONE IN DIRECT PROPORTION TO AND IN RESPONSE TO CHANGES IN THE VOLUME OF CONCENTRATED POLYMER SOLUTION PRESENT THEREIN AND VARYING THE RATE OF WITHDRAWAL OF THE CONCENTRATED POLYMER SO-
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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |