Patent US2953538A successfully refreshed from Google Patents.
US2953538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of spinning acrylonitrile polymer solution in a mixture of solvents
Assignee: EIDP Inc
•
Filing: 1957-10-18
•
Granted: 1960-09-20
•
Expires: 1977-10-18
Abstract
No abstract record available.
Inventors
- 👤 Lyman Donald Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:17
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
PROCESS COMPRISING THE STEPS OF ADMIXING AT LEAST 10% BY WEIGHT OF A POLYMER OF ACRYLONITRILE CONTAINING AT LEAST ABOUT 85% BY WEIGHT COMBINED ACRYLONITRILE, IN A MEDIUM COMPRISING (1) A SOLVENT FROM THE CLASS CONSISTING OF N,N-DIMETHYLFORMAMIDE, N,N-DIMETHYLACETAMIDE, AND N-METHYLPYRROLIDONE, AND (2) FROM ABOUT 20% TO ABOUT 30% BY VOLUME OF THE SOLVENT MEDIUM OF AN ALIPHATIC KETONE HAVING A BOILING POINT OF LESS THAN ABOUT 150*C. AND DISSOLVING ALL OF SAID POLYMER IN THE SOLVENT MEDIUM BY HEATING THE MIXTURE TO FORM A SOLUTION CONTAINING AT LEAST ABOUT 10% BY WEIGHT OF THE ACRLONITRILE POLYMER AND HAVING A VISCOSITY BETWEEN ABOUT 25 AND ABOUT 750 POISES AND SPINNING THE SOLUTION INTO A FILAMENT AT A TEMPERATURE SUBSTANTIALLY LESS THAN THAT REQUIRED FOR SPINNING A SOLUTION OF THE SAME ACRYLONITRILE POLYMER IN THE SAME SOLVENT ALONE AND HAVING SUBSTANTIALLY THE SAME VISCOSITY AS THE SOLUTION OF THE POLYMER IN THE MIXED SOLVENT MEDIUM.
Claim 2
Dependent Claim
154 words
PROCESS COMPRISING THE STEPS OF ADMIXING AT LEAST 10% BY WEIGHT OF A POLYMER OF ACRYLONITRILE CONTAINING AT LEAST ABOUT 85% BY WEIGHT COMBINED ACRYLONITRILE, IN A MEDIUM COMPRISING (1) A SOLVENT FROM THE CLASS CONSISTING OF N,N-DIMETHYLFORMAMIDE, N,N-DIMETHYLACETAMIDE, AND N-METHYLPYRROLIDONE, AND (2) FROM ABOUT 20% TO ABOUT 30% BY VOLUME OF THE SOLVENT MEDIUM OF AN ALIPHATIC KETONE HAVING A BOILING POINT OF LESS THAN ABOUT 150*C. AND DISSOLVING ALL OF SAID POLYMER IN THE SOLVENT MEDIUM BY HEATING THE MIXTURE TO FORM A SOLUTION CONTAINING AT LEAST ABOUT 10% BY WEIGHT OF THE ACRLONITRILE POLYMER AND HAVING A VISCOSITY BETWEEN ABOUT 25 AND ABOUT 750 POISES AND SPINNING THE SOLUTION INTO A FILAMENT AT A TEMPERATURE SUBSTANTIALLY LESS THAN THAT REQUIRED FOR SPINNING A SOLUTION OF THE SAME ACRYLONITRILE POLYMER IN THE SAME SOLVENT ALONE AND HAVING SUBSTANTIALLY THE SAME VISCOSITY AS THE SOLUTION OF THE POLYMER IN THE MIXED SOLVENT MEDIUM.
References Cited (Backward Citations)
US2776947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |