Patent DE337299C successfully refreshed from Google Patents.
Patent US3309348A successfully refreshed from Google Patents.
US3309348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of carboxy-terminated polymers
Assignee: Phillips Petroleum Co
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Filing: 1963-04-05
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Granted: 1967-03-14
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles A Wentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:38
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08C2/00; C08C2/02; C08C2/04; C08C2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF AN HCL-FREE CARBOXY-TERMINATED POLYMER FROM A SOLUTION OF SAID POLYMER AND A HYDROCARBON DILUENT ALSO CONTAINING AN ALKALI METAL HALIDE BY ADMIXING THE POLYMER SOLUTION WITH SUFFICIENT METHANOL WHICH WILL FORM A METHANOL PHASE AND A DILUENT PHASE UPON STANDING, AND WHICH WILL REMOVE FROM THE SOLUTION INTO THE RESULTING METHANOL PHASE SAID RESIDUE, AND WHEREIN THE TWO PHASES ARE SEPARATED, THE IMPROVEMENT COMPRISING, BEFORE THE METHANOL ADDITION, ADDING TO SAID SOLUTION ANHYDROUS HYDROGEN CHLORIDE IN AN AMOUNT RANGING BETWEEN 0.01 TO 0.14 GRAM HCL PER GRAM OF SAID POLYMER, AND RECOVERING THE POLYMER SUBSTANTIALLY FREE FROM SAID CATALYST RESIDUE FROM THE RESULTING DILUENT PHASE.
Claim 2
Dependent Claim
114 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF AN HCL-FREE CARBOXY-TERMINATED POLYMER FROM A SOLUTION OF SAID POLYMER AND A HYDROCARBON DILUENT ALSO CONTAINING AN ALKALI METAL HALIDE BY ADMIXING THE POLYMER SOLUTION WITH SUFFICIENT METHANOL WHICH WILL FORM A METHANOL PHASE AND A DILUENT PHASE UPON STANDING, AND WHICH WILL REMOVE FROM THE SOLUTION INTO THE RESULTING METHANOL PHASE SAID RESIDUE, AND WHEREIN THE TWO PHASES ARE SEPARATED, THE IMPROVEMENT COMPRISING, BEFORE THE METHANOL ADDITION, ADDING TO SAID SOLUTION ANHYDROUS HYDROGEN CHLORIDE IN AN AMOUNT RANGING BETWEEN 0.01 TO 0.14 GRAM HCL PER GRAM OF SAID POLYMER, AND RECOVERING THE POLYMER SUBSTANTIALLY FREE FROM SAID CATALYST RESIDUE FROM THE RESULTING DILUENT PHASE.
References Cited (Backward Citations)
US1515001A
Cited
US3108994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |