US3563975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of polymer powders from pressurized solutions of polymer
Assignee: Phillips Petroleum Co
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Filing: 1969-06-12
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Granted: 1971-02-16
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Expires: 1989-06-12
Abstract
Abstract HIGH DENSITY POLYMER POWDER ARE DIRECTLY FORMED FROM A HOT PRESSURIZED SOLUTION OF A POLYMER BY PASSING THE POLYMER SOLUTION TO AN ELONGATED COOLING MEANS THEREBY INDIRECTLY COOLING THE SOLUTION TO PRECIPITATE THE POLYMER WHILE MAINTAINING THE SOLUTION UNDER SUFFICIENT PRESSURE TO PREVENT SUBSTANTIAL VAPORIZATION OF THE SOLVENT. THE RESULTING SLURRY IS INTERMITTENTLY REMOVED FROM THE ELONGATED COOLING MEANS AND INTRODUCED INTO A ZONE MAINTAINED AT A PRESSURE SUFFICIENTLY LOWER THAN THE PRESSURE OF THE SOLUTION TO CAUSE VAPORIZATION OF THE SOLVENT.
Inventors
- 👤 Fredrick J Zavasnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:21
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2323/00; C08J2323/02
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |