US2916348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyacrylonitrile filaments
Assignee: Wyeth Holdings LLC
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Filing: 1956-08-21
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Granted: 1959-12-08
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Expires: 1976-08-21
Abstract
No abstract record available.
Inventors
- 👤 Cresswell Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN THE PRODUCTION OF FILAMENTS FROM A FILAMENTFORMING INORGANIC ACID SALT OF AN ACRYLONITRILE POLYMER THAT CONTAINS, BY WEIGHT, A MAJOR AMOUNT OF ACRYLONITRILE AND A MINOR AMOUNT OF A VINYLPYRIDINE COMBINED IN THE POLYMER MOLECULE, SAID INORGANIC ACID SALT BEING SELECTED FROM THE CLASS CONSISTING OF (A) THIOCYANIC ACID SALT OF THE SAID POLYMER AND (B) INORGANIC ACID SALTS OF THE SAID POLYMER THAT ARE CONVERTIBLE INTO THIOCYANIC ACID SALT OF THE SAID POLYMER WHEN THE FORMER IS BROUGHT INTO CONTACT WITH AN AQUEOUS COMPOSITION CONTAINING A WATER-SOLUBLE THIOCYANATE, THE IMPROVEMENT WHICH COMPRISES WET-SPINNING, INTO AN AQUEOUS COAGULATING BATH, A SOLUTION OF THE SAID SALT OF THE SAID POLYMER TO FORM A GELLED FILAMENTARY MATERIAL, AT LEAST ONE OF THE COMPOSITION CONSTITUTING THE SAID AQUEOUS COAGULATING BATH AND THE SAID SOLUTION CONTAINING A WATER-SOLUBLE THIOCYANATE: AND CONTACTING THE SAID GELLED FILAMENTARY MATERIAL WITH AN AQUEOUS AMMONIACAL SOLUTION HAVING A PH RANGING BETWEEN ABOUT 8 AND ABOUT 11 TO RENDER THE SAID FILAMENTARY MATERIAL SUBSTANTIALLY FREE OF BOUND ANIONS.
Claim 2
Dependent Claim
169 words
IN THE PRODUCTION OF FILAMENTS FROM A FILAMENTFORMING INORGANIC ACID SALT OF AN ACRYLONITRILE POLYMER THAT CONTAINS, BY WEIGHT, A MAJOR AMOUNT OF ACRYLONITRILE AND A MINOR AMOUNT OF A VINYLPYRIDINE COMBINED IN THE POLYMER MOLECULE, SAID INORGANIC ACID SALT BEING SELECTED FROM THE CLASS CONSISTING OF (A) THIOCYANIC ACID SALT OF THE SAID POLYMER AND (B) INORGANIC ACID SALTS OF THE SAID POLYMER THAT ARE CONVERTIBLE INTO THIOCYANIC ACID SALT OF THE SAID POLYMER WHEN THE FORMER IS BROUGHT INTO CONTACT WITH AN AQUEOUS COMPOSITION CONTAINING A WATER-SOLUBLE THIOCYANATE, THE IMPROVEMENT WHICH COMPRISES WET-SPINNING, INTO AN AQUEOUS COAGULATING BATH, A SOLUTION OF THE SAID SALT OF THE SAID POLYMER TO FORM A GELLED FILAMENTARY MATERIAL, AT LEAST ONE OF THE COMPOSITION CONSTITUTING THE SAID AQUEOUS COAGULATING BATH AND THE SAID SOLUTION CONTAINING A WATER-SOLUBLE THIOCYANATE: AND CONTACTING THE SAID GELLED FILAMENTARY MATERIAL WITH AN AQUEOUS AMMONIACAL SOLUTION HAVING A PH RANGING BETWEEN ABOUT 8 AND ABOUT 11 TO RENDER THE SAID FILAMENTARY MATERIAL SUBSTANTIALLY FREE OF BOUND ANIONS.
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) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |