US2912415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon disulfide activation in pyrrolidone polymerization
Assignee: Solutia Inc
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Filing: 1958-04-16
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Granted: 1959-11-10
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Expires: 1978-04-16
Abstract
No abstract record available.
Inventors
- 👤 William B Black
- 👤 Howard G Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR POLYMERIZING PYRROLIDONE WHICH COMPRISES FORMING A MIXTURE CONTAINING MONOMERIC PYRROLIDONE, CARBON DISULFIDE, AND A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, PYRROLIDONE SALTS, HYDRIDES OF ALKALI METALS, ALKYL AND ARYL SALTS OF ALKALI METALS, HYDROXIDES AND OXIDES OF ALKALI METALS, THE MOLAR RATIO OF CARBON DISULSFIDE DTO CATALYST BEING IN THE RANGE OF 1:1,1 TO 1:200 AND THE MOLAR RATIO OF CATALYST TO PYRROLIDONE BEING IN THE RANGE OF 1:5 TO 1:280 AND SUBJECTING SAID MIXTURE TO A TEMPERATURE IN THE RANGE OF -70*C, TO 100*C, UNTIL POLYMERIZATION IS COMPLETE.
Claim 2
Dependent Claim
95 words
A PROCESS FOR POLYMERIZING PYRROLIDONE WHICH COMPRISES FORMING A MIXTURE CONTAINING MONOMERIC PYRROLIDONE, CARBON DISULFIDE, AND A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, PYRROLIDONE SALTS, HYDRIDES OF ALKALI METALS, ALKYL AND ARYL SALTS OF ALKALI METALS, HYDROXIDES AND OXIDES OF ALKALI METALS, THE MOLAR RATIO OF CARBON DISULSFIDE DTO CATALYST BEING IN THE RANGE OF 1:1,1 TO 1:200 AND THE MOLAR RATIO OF CATALYST TO PYRROLIDONE BEING IN THE RANGE OF 1:5 TO 1:280 AND SUBJECTING SAID MIXTURE TO A TEMPERATURE IN THE RANGE OF -70*C, TO 100*C, UNTIL POLYMERIZATION IS COMPLETE.
References Cited (Backward Citations)
US2809958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |