Patent US2957748A successfully refreshed from Google Patents.
US2957748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fibers and threads having high dyestuff affinity from polyacrylonitrile
Assignee: BASF SE
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Filing: 1958-08-22
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Granted: 1960-10-25
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Expires: 1978-08-22
Abstract
No abstract record available.
Inventors
- 👤 Lieseberg Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:45
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN THE PROCESS FOR THE PRODUCTION OF FIBERS AND THREADS FROM POLYACRYLONITRILE BY EXTRUDING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE THROUGH A JET INTO AIR, PASSING THE RESULTING FILAMENTS THROUGH A SPINNING FUNNEL INTO A COAGULATING LIQUID COMPRISING DIMETHYLFORMAMIDE AND WATER AND STRETCHING SAID FILAMENTS IN THE PRESENCE OF A AQUEOUS LIQUID, THE STEPS COMPRISING WITHDRAWING SAID FILAMENTS FROM SAID COAGULATING LIQUID, PASSING SAID FILAMENTS THROUGH A FIRST STRETCHING BATH COMPRISING 2 TO 20 PERCENT BY WEIGHT OF DIMETHYLFORMAMIDE AND 98 TO 80 PERCENT BY WEIGHT OF WATER, AND THEN PASSING SAID FILAMENTS THROUGH TWO ADDITIONAL STRETCHING BATHS COMPRISING DIMETHYLFORMAMIDE AND WATER, THE THREE STRETCHING BATHS HAVING (A) DIMETHYLFORMAMIDE CONTENTS WHICH DECREASE IN A RATIO OF APPROXIMATELY 1:1/2:1/100, (B) PH VALUES WHICH INCREASE BETWEEN THE LIMITS 5 TO 7, AND (C) A TEMPERATURE WHICH LIES BETWEEN 15 TO 100*C.
Claim 2
Dependent Claim
139 words
IN THE PROCESS FOR THE PRODUCTION OF FIBERS AND THREADS FROM POLYACRYLONITRILE BY EXTRUDING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE THROUGH A JET INTO AIR, PASSING THE RESULTING FILAMENTS THROUGH A SPINNING FUNNEL INTO A COAGULATING LIQUID COMPRISING DIMETHYLFORMAMIDE AND WATER AND STRETCHING SAID FILAMENTS IN THE PRESENCE OF A AQUEOUS LIQUID, THE STEPS COMPRISING WITHDRAWING SAID FILAMENTS FROM SAID COAGULATING LIQUID, PASSING SAID FILAMENTS THROUGH A FIRST STRETCHING BATH COMPRISING 2 TO 20 PERCENT BY WEIGHT OF DIMETHYLFORMAMIDE AND 98 TO 80 PERCENT BY WEIGHT OF WATER, AND THEN PASSING SAID FILAMENTS THROUGH TWO ADDITIONAL STRETCHING BATHS COMPRISING DIMETHYLFORMAMIDE AND WATER, THE THREE STRETCHING BATHS HAVING (A) DIMETHYLFORMAMIDE CONTENTS WHICH DECREASE IN A RATIO OF APPROXIMATELY 1:1/2:1/100, (B) PH VALUES WHICH INCREASE BETWEEN THE LIMITS 5 TO 7, AND (C) A TEMPERATURE WHICH LIES BETWEEN 15 TO 100*C.
References Cited (Backward Citations)
US2721785A
Cited
US2723900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |