US3073669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing shaped articles from polymers and copolymers of acrylonitrile
Assignee: Asahi Kasei Corp
•
Filing: 1959-08-24
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Granted: 1963-01-15
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Expires: 1979-08-24
Abstract
No abstract record available.
Inventors
- 👤 Fujisaki Yoshisato
- 👤 Kobayashi Hidehiko
- 👤 Tazaki Ichiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF PRODUCING SHAPED ARTICLE FROM ACRYLONITRILE POLYMERIZATION PRODUCT COMPRISING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE, WHICH COMPRISES DISSOLVING SAID POLYMERIZATION PRODUCT IN NITRIC ACID HAVING A CONCENTRATION OF AT LEAST 69% SO THAT THE RESULTANT SOLUTION HAS VISCOSITY OF MORE THAN 1000 POISES, EXTRUDING THE SOLUTION INTO A COAGULATION BATH CONTAINING 47-50% NITRIC ACID, STRETCHING THE EXTRUDED MASS IN THE COAGULATION BATH, WASHING THE STRETCHED MASS WITH WATER, HEAT-STRETCHING THE WASHED MASS UNTIL THE MOLECULES ARE ORIENTATED AND THEN DRYING.
Claim 2
Independent Claim
83 words
A METHOD OF PRODUCING SHAPED ARTICLE FROM ACRYLONITRILE POLYMERIZATION PRODUCT COMPRISING AT LEAST 85% BY WEIGHT OF ACRYLONITRILE, WHICH COMPRISES DISSOLVING SAID POLYMERIZATION PRODUCT IN NITRIC ACID HAVING A CONCENTRATION OF AT LEAST 69% SO THAT THE RESULTANT SOLUTION HAS VISCOSITY OF MORE THAN 1000 POISES, EXTRUDING THE SOLUTION INTO A COAGULATION BATH CONTAINING 47-50% NITRIC ACID, STRETCHING THE EXTRUDED MASS IN THE COAGULATION BATH, WASHING THE STRETCHED MASS WITH WATER, HEAT-STRETCHING THE WASHED MASS UNTIL THE MOLECULES ARE ORIENTATED AND THEN DRYING.
References Cited (Backward Citations)
FR632782A
Cited
GB330347A
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GB371340A
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US2140921A
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FR850075A
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GB534828A
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US2579451A
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US2670268A
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US2716586A
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US2790700A
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US2878097A
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FR819416A
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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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |