US2930786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of entrained solvent from vaporized solvent from flashing step
Assignee: Phillips Petroleum Co
•
Filing: 1956-10-22
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Granted: 1960-03-29
•
Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 John E Cottle
- 👤 James I Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:40
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
IN THE PROCESS OF SEPARATING A NORMALLY SOLID THERMOPLASTIC POLYMER FROM SOLUTION IN A LIQUID SOLVENT BY HEATING AND FLASHING THE SOLUTION INTO A ZONE OF REDUCED PRESSURE AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER TO VAPORIZE THE SOLVENT, THE STEPS OF CONTACTING THE VAPORIZED SOLVENT WITH A STREAM OF SAID LIQUID SOLVENT SO AS TO WET FINELY DIVIDED PARTICLES OF SOLID POLYMER CONTAINED IN SAID VAPORIZED SOLVENT, AND REMOVING A MIXTURE OF SOLID POLYMER AND LIQUID SOLVENT FROM SAID VAPORIZED SOLVENT.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |