US3072626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer recovery process
Assignee: Phillips Petroleum Co
•
Filing: 1955-03-24
•
Granted: 1963-01-08
•
Expires: 1975-03-24
Abstract
No abstract record available.
Inventors
- 👤 Martin R Cines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:26
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S159/39
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR RECOVERING A NORMALLY SOLID THERMOPLASTIC POLYMER FROM A SOLUTION THEREOF IN A SOLVENT, WHICH PROCESS COMPRISES VAPORIZING A SUBSTANTIAL PORTION OF THE SOLVENT FROM SAID SOLUTION AT A TEMPERATURE ABOVE THE MELTING POINT OF SAID POLYMER, SUBJECTING THE RESULTING POLYMER SOLUTION TO VACUUM FLASHING THE ABSENCE OF OTHER MATERIAL AT A MAXIMUM PRESSURE OF 13 P.S.I.A. AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER AND COLLECTING AS A PRODUCT OF SAID VAPORIZATION A SOLID RESIDUE CONSISTING OF SAID POLYMER AND A MINOR AMOUNT OF SOLVENT, SUBJECTING SAID SOLID RESIDUE TO MIXING AT A TEMPERATURE ABOVE ITS MELTING POINT WHILE VAPORIZING MOST OF THE REMAINING SOLVENT THEREFROM, SOLIDIFYING THE POLYMER SO OBTAINED, AND RECOVERING SOLID, SUBSTANTIALLY PURIFIED POLYMER.
Claim 2
Dependent Claim
122 words
A PROCESS FOR RECOVERING A NORMALLY SOLID THERMOPLASTIC POLYMER FROM A SOLUTION THEREOF IN A SOLVENT, WHICH PROCESS COMPRISES VAPORIZING A SUBSTANTIAL PORTION OF THE SOLVENT FROM SAID SOLUTION AT A TEMPERATURE ABOVE THE MELTING POINT OF SAID POLYMER, SUBJECTING THE RESULTING POLYMER SOLUTION TO VACUUM FLASHING THE ABSENCE OF OTHER MATERIAL AT A MAXIMUM PRESSURE OF 13 P.S.I.A. AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER AND COLLECTING AS A PRODUCT OF SAID VAPORIZATION A SOLID RESIDUE CONSISTING OF SAID POLYMER AND A MINOR AMOUNT OF SOLVENT, SUBJECTING SAID SOLID RESIDUE TO MIXING AT A TEMPERATURE ABOVE ITS MELTING POINT WHILE VAPORIZING MOST OF THE REMAINING SOLVENT THEREFROM, SOLIDIFYING THE POLYMER SO OBTAINED, AND RECOVERING SOLID, SUBSTANTIALLY PURIFIED POLYMER.
References Cited (Backward Citations)
US2273822A
Cited
US2332276A
Cited
US2350400A
Cited
US2496653A
Cited
US2561256A
Cited
US2766224A
Cited
US2691647A
Cited
US2825721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |