US3726843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for isolating epdm elastomers from their solvent solutions
Assignee: EIDP Inc
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Filing: 1970-11-03
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Granted: 1973-04-10
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Expires: 1990-11-03
Abstract
Abstract IN A CONTINUOUS PROCESS FOR RECOVERING AN AMORPHOUS HYDROCARBON COPOLYMER OF ETHYLENE FROM SOLUTION BY HEATING THE SOLUTION AT SUPERATMOSPHERIC PRESSURE TO FORM TWO LIQUID PHASES, A SOLVENT PHASE AND A COPOLYMER-RICH PHASE, AND SEPARATING THE PHASES, THE IMPROVEMENT OF CONTINUOUSLY PASSING THE COPOLYMER-RICH PHASE INTO AN INTERMEDIATE LOWER PRESSURE ZONE UNDER SUBSTANTIALLY ADIABATIC CONDITIONS AND THEN EXTRUDING THE RESULTING COPOLYMER-RICH PHASE AT A CONTROLLED RATE INTO A VAPORIZATION ZONE UNDER SUBSTANTIALLY ADIABATIC CONDITIONS TO VAPORIZE RESIDUAL SOLVENT AND FORM THE COPOLYMER INTO SOLID BODIES.
Inventors
- 👤 C Anolick
- 👤 E Slocum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |