Patent US2558731A successfully refreshed from Google Patents.
US2558731A
Expired / Lapsed
US
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Method of producing synthetic fibers from polymers and copolymers of acrylonitrile
Assignee: Wyeth Holdings LLC
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Filing: 1949-01-27
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Granted: 1951-07-03
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Expires: 1969-01-27
Abstract
No abstract record available.
Inventors
- 👤 Cresswell Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:14
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/702; D01; D01D; D01D1/00; D01D1/06; D01D10/00; D01D10/04; D01D10/0436; D01D10/0445; D01D5/00; D01D5/06; D01D5/22; D01F; D01F6/00; D01F6/02; D01F6/18; D02; D02J; D02J1/00; D02J1/22; D02J1/223; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/19; Y10S425/00; Y10S425/017
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF PRODUCING A SYNTHETIC FIBER FROM A SOLUBLE, THERMOPLASTIC PRODUCT OF POLYMERIZATION OF A POLYMERIZABLE MASS COMPRISING MAINLY ACRYLONITRILE, SAID METHOD COMPRISING EXTRUDING THE SAID PRODUCT IN THE FORM OF A FIBER FROM A WATER-COAGULABLE SOLUTION OF THE SAID POLYMERIZATION PRODUCT DISSOVLED IN A CONCENTRATED AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT WHICH YIELDS HIGHLY HYDRATED IONS IN AQUEOUS SOLUTION; IMMEDIATELY AFTER EXTRUSION CONTACTING THE EXTRUDED MASS WITH A LIQUID COAGULANT COMPRISING WATER, SAID COAGULATING BEING AT A TEMPERATURE NOT EXCEEDING +10* C., THEREBY TO PRECIPITATE THE SAID PRODUCT FROM THE SAID SOLUTION AS A STRETCHABLE, GELLED FIBER; CONTINUOUSLY STRECTCHING THE SAID GELLED FIBER, WHILE IT IS IN CONTACT ONLY WITH A FLUIF MEDIUM COMPRISING MOISTURE, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 70* C. TO ABOUT 100* C.; AND CONTINUOUSLY DRYING THE STRETCHED FIBER.
Claim 2
Independent Claim
137 words
THE METHOD OF PRODUCING A SYNTHETIC FIBER FROM A SOLUBLE, THERMOPLASTIC PRODUCT OF POLYMERIZATION OF A POLYMERIZABLE MASS COMPRISING MAINLY ACRYLONITRILE, SAID METHOD COMPRISING EXTRUDING THE SAID PRODUCT IN THE FORM OF A FIBER FROM A WATER-COAGULABLE SOLUTION OF THE SAID POLYMERIZATION PRODUCT DISSOVLED IN A CONCENTRATED AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT WHICH YIELDS HIGHLY HYDRATED IONS IN AQUEOUS SOLUTION; IMMEDIATELY AFTER EXTRUSION CONTACTING THE EXTRUDED MASS WITH A LIQUID COAGULANT COMPRISING WATER, SAID COAGULATING BEING AT A TEMPERATURE NOT EXCEEDING +10* C., THEREBY TO PRECIPITATE THE SAID PRODUCT FROM THE SAID SOLUTION AS A STRETCHABLE, GELLED FIBER; CONTINUOUSLY STRECTCHING THE SAID GELLED FIBER, WHILE IT IS IN CONTACT ONLY WITH A FLUIF MEDIUM COMPRISING MOISTURE, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 70* C. TO ABOUT 100* C.; AND CONTINUOUSLY DRYING THE STRETCHED FIBER.
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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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |