US3368015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinning of acrylonitrile polymer solutions
Assignee: Phrix Werke AG
•
Filing: 1963-07-09
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Granted: 1968-02-06
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Irion Wilhelm
- 👤 Saar Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F8/00; C08F8/50; 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
112 words
METHOD OF IMPROVING THE SPINNABILITY OF POLYACRYLONITRILE SOLUTIONS, WHICH COMPRISES SUBJECTING A SPINNING SOLUTION CONSISTING ESSENTIALLY OF AT LEAST ONE POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND COPOLYMERS OF POLYACRYLONITRILE COMPOSED OF AT LEAST 85% BY WEIGHT OF ACRYLONITRILE UNITS, DISSOLVED IN AN AQUEOUS ZINC CHLORIDE SOLUTION TO A HEAT TREATMENT AT A TEMPERATURE OF BETWEEN ABOUT 35*C. AND 120*C., AND TERMINATING SAID HEAT TREATMENT WHEN THE ADDITION UNDER STIRRING OF BETWEEN ABOUT 5.5 AND 8.5 CC. OF WATER TO 2 G. OF SAID SPINNING SOLUTION DILUTED WITH 10 CC. OF SAID AQUEOUS ZINC CHLORIDE SOLUTION CAUSES THE RESULTING SOLUTION TO BECOME TURBID; AND SPINNING THE THUS TREATED SPINNING SOLUTION.
Claim 2
Dependent Claim
112 words
METHOD OF IMPROVING THE SPINNABILITY OF POLYACRYLONITRILE SOLUTIONS, WHICH COMPRISES SUBJECTING A SPINNING SOLUTION CONSISTING ESSENTIALLY OF AT LEAST ONE POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND COPOLYMERS OF POLYACRYLONITRILE COMPOSED OF AT LEAST 85% BY WEIGHT OF ACRYLONITRILE UNITS, DISSOLVED IN AN AQUEOUS ZINC CHLORIDE SOLUTION TO A HEAT TREATMENT AT A TEMPERATURE OF BETWEEN ABOUT 35*C. AND 120*C., AND TERMINATING SAID HEAT TREATMENT WHEN THE ADDITION UNDER STIRRING OF BETWEEN ABOUT 5.5 AND 8.5 CC. OF WATER TO 2 G. OF SAID SPINNING SOLUTION DILUTED WITH 10 CC. OF SAID AQUEOUS ZINC CHLORIDE SOLUTION CAUSES THE RESULTING SOLUTION TO BECOME TURBID; AND SPINNING THE THUS TREATED SPINNING SOLUTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |