Patent US2949435A successfully refreshed from Google Patents.
US2949435A
Expired / Lapsed
US
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Method for the preparation of acrylonitrile graft copolymer fiber-forming systems
Assignee: Dow Chemical Co
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Filing: 1956-03-05
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Granted: 1960-08-16
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Expires: 1976-03-05
Abstract
No abstract record available.
Inventors
- 👤 Clyde W Davis
- 👤 John F Voeks
- 👤 Forrest A Ehlers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:35
CPC Classifications
C; C08; C08F; C08F271/00; C08F271/02; C08F291/00; D; D01; D01F; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
METHOD OF FORMING WET SPUN SHAPED ARTICLES WHICH METHOD CONSISTS OF THE STEPS OF (1) DISSOLVING, IN AN AQUEOUS SALINE SOLUTION THAT IS SOLVENT FOR POLYACRYLONITRILE, (A) A MONOETHYLENICALLY UNSATURATED MONOMERIC MATERIAL COMPRISED OF AT LEAST A PREDOMINANT PROPORTION OF ACRYLONITRILE, ANY BALANCE BEING ANOTHER MONOETHYLENICALLY UNSATURATED MONOMERIC MATERIAL THAT IS COPOLYMERIZABLE WITH ACRYLONITRILE AND (B) POLYVINYL PYRROLIDONE, (2) POLYMERIZING THE DISSOLVED MONOMERIC MATERIAL IN THE PRESENCE OF THE DISSOLVED POLYVINYL PYRROLIDONE TO FORM A FIBER-FORMING GRAFT COPOLYMER-CONTAINING POLYMERIC SUBSTANCE IN SPINNABLE DISPERSION IN SAID AQUEOUS, POLYACRYLONITRILE-DISSOLVING, SALINE SOLUTION, THEN (3) EXTRUDING SAID FIBER-FORMING POLYMERIC SUBSTANCE IN SPINNABLE DISPERISION INTO A SHAPED ARTICLE IN A COAGULATING LIQUID FOR SAID SPINNABLE DISPERSION
Claim 2
Dependent Claim
111 words
METHOD OF FORMING WET SPUN SHAPED ARTICLES WHICH METHOD CONSISTS OF THE STEPS OF (1) DISSOLVING, IN AN AQUEOUS SALINE SOLUTION THAT IS SOLVENT FOR POLYACRYLONITRILE, (A) A MONOETHYLENICALLY UNSATURATED MONOMERIC MATERIAL COMPRISED OF AT LEAST A PREDOMINANT PROPORTION OF ACRYLONITRILE, ANY BALANCE BEING ANOTHER MONOETHYLENICALLY UNSATURATED MONOMERIC MATERIAL THAT IS COPOLYMERIZABLE WITH ACRYLONITRILE AND (B) POLYVINYL PYRROLIDONE, (2) POLYMERIZING THE DISSOLVED MONOMERIC MATERIAL IN THE PRESENCE OF THE DISSOLVED POLYVINYL PYRROLIDONE TO FORM A FIBER-FORMING GRAFT COPOLYMER-CONTAINING POLYMERIC SUBSTANCE IN SPINNABLE DISPERSION IN SAID AQUEOUS, POLYACRYLONITRILE-DISSOLVING, SALINE SOLUTION, THEN (3) EXTRUDING SAID FIBER-FORMING POLYMERIC SUBSTANCE IN SPINNABLE DISPERISION INTO A SHAPED ARTICLE IN A COAGULATING LIQUID FOR SAID SPINNABLE DISPERSION
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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |