US2936211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of producing polyacrylonitrile filaments
Assignee: Wyeth Holdings LLC
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Filing: 1957-04-18
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Granted: 1960-05-10
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Expires: 1977-04-18
Abstract
No abstract record available.
Inventors
- 👤 Witold R Kocay
- 👤 William J Clark
- 👤 George P Vescio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:00
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/38; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A PROCESS FOR PRODUCING FILAMENTS HAVING INCREASED DYE-RECEPTIVITY FROM A FILAMENT-FORMING COPOLYMER OF, BY WIEGHT, FROM 80% TO 96% ACRYLONITRILE, FROM 2% TO 40% OF A VINYLPYRIDINE AND FROM 2% TO 10% OF A DIFFERENT MONEOTHYLENICALLY UNSATUREATED MATERIAL IN WHICH THE GELLED FILAMENTARY MATERIAL, FORMED BY WET-SPINNING SAID COPOLYMER INTO A COAGULATING BATH CONTAINING FROM ABOUT 3% TO ABOUT 25% BY WEIGHT OF A WATER SOLUBLE THIOCYANATE, IS THAN SUBSTANTIALLY FREED FROM BOUND ANIONS BY A TREATMENT WITH AN AMMONIACAL SOLUTION, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE SAID RESULTING GELLED FILAMENTARY MATERIAL WITH AN AQUEOUS SOLUTION OF AN ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 1.76X10**-4, THEREBY CONVERTING SAID WET, GELLED MATERIAL SUBSTANTIALLY COMPLETELY TO THE ACID SALT FORM WASHING SAID MATERIAL FREE OF EXCESS SAID AND DRYING THE WASHED FILAMENTARY MATERIAL.
Claim 2
Dependent Claim
134 words
IN A PROCESS FOR PRODUCING FILAMENTS HAVING INCREASED DYE-RECEPTIVITY FROM A FILAMENT-FORMING COPOLYMER OF, BY WIEGHT, FROM 80% TO 96% ACRYLONITRILE, FROM 2% TO 40% OF A VINYLPYRIDINE AND FROM 2% TO 10% OF A DIFFERENT MONEOTHYLENICALLY UNSATUREATED MATERIAL IN WHICH THE GELLED FILAMENTARY MATERIAL, FORMED BY WET-SPINNING SAID COPOLYMER INTO A COAGULATING BATH CONTAINING FROM ABOUT 3% TO ABOUT 25% BY WEIGHT OF A WATER SOLUBLE THIOCYANATE, IS THAN SUBSTANTIALLY FREED FROM BOUND ANIONS BY A TREATMENT WITH AN AMMONIACAL SOLUTION, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE SAID RESULTING GELLED FILAMENTARY MATERIAL WITH AN AQUEOUS SOLUTION OF AN ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 1.76X10**-4, THEREBY CONVERTING SAID WET, GELLED MATERIAL SUBSTANTIALLY COMPLETELY TO THE ACID SALT FORM WASHING SAID MATERIAL FREE OF EXCESS SAID AND DRYING THE WASHED FILAMENTARY MATERIAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |