Patent US3244688A successfully refreshed from Google Patents.
US3244688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for processing of polymers
Assignee: Phillips Petroleum Co
•
Filing: 1962-04-16
•
Granted: 1966-04-05
•
Expires: 1982-04-16
Abstract
No abstract record available.
Inventors
- 👤 Robert R Goins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:25
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
109 words
A PROCESS FOR RECOVERING SOLID POLYMER FROM A SOLUTION OF SAID POLYMER IN A SOLVENT WHICH COMPRISES PASSING SAID SOLUTION INTO A FLASH ZONE OF REDUCED PRESSURE WHEREIN THE TEMPERATURE IS BELOW THE MELTING POINT OF THE POLYMER SO THAT AT LEAST A PORTION OF THE SOLVENT IS EVAPORATED; REMOVING SOLVENT FROM SAID FLASH ZONE; AND SIMULTANEOUSLY COMPRESSING THE RESULTING SOLID POLYMER RESIDUE IN THE FORM OF FILAMENTS IN SAID FLASH ZONE AND PASSING SAME TO A DRYING ZONE IN A SINGLE STEP WHEREBY THE BULK DENSITY OF THE POLYMER RESIDUE IS INCREASED AND ADDITIONAL SOLVENT IS REMOVED THEREFROM WHILE SAID POLYMER IS BEING PASSED TO SAID DRYING ZONE.
Claim 2
Dependent Claim
109 words
A PROCESS FOR RECOVERING SOLID POLYMER FROM A SOLUTION OF SAID POLYMER IN A SOLVENT WHICH COMPRISES PASSING SAID SOLUTION INTO A FLASH ZONE OF REDUCED PRESSURE WHEREIN THE TEMPERATURE IS BELOW THE MELTING POINT OF THE POLYMER SO THAT AT LEAST A PORTION OF THE SOLVENT IS EVAPORATED; REMOVING SOLVENT FROM SAID FLASH ZONE; AND SIMULTANEOUSLY COMPRESSING THE RESULTING SOLID POLYMER RESIDUE IN THE FORM OF FILAMENTS IN SAID FLASH ZONE AND PASSING SAME TO A DRYING ZONE IN A SINGLE STEP WHEREBY THE BULK DENSITY OF THE POLYMER RESIDUE IS INCREASED AND ADDITIONAL SOLVENT IS REMOVED THEREFROM WHILE SAID POLYMER IS BEING PASSED TO SAID DRYING 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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |