US3268490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polyacrylonitrile fibers
Assignee: Individual
•
Filing: 1962-03-07
•
Granted: 1966-08-23
•
Expires: 1982-03-07
Abstract
No abstract record available.
Inventors
- 👤 Sunden Olof
- 👤 Tunefors Sten Erik Arn Lennart
- 👤 Sonnerskog Sven Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:54
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/20; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A FIBER-FORMING COMPOSITION OF MATTER WHICH IS SOLUBLE IN A POLYMER SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAIDE, DIMETHYLACETAMIDE, DIMETHYLSULFOXIDE, BUTYROLACETONE, ETHYLENE CARBONATE AND DIMETHYL METHOXYACETAMIDE COMPRISING AN ACRYLONITRILE COPOLYMER CONTAINING AT LEAST 85 MOLAR PERCENT OF ACRYLONITRILE UNITS AND UP TO ABOUT 15 MOLAR PERCENT OF A MONOETHYLENICALLY UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL ACETATE, VINYL CHLORIDE, VINYLIDENE CHLORIDE, ACRYLIC ACID, ACRYLAMIDE, METHACRYLONITRILE, METHACRYLAMIDE AND AN ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID, AND CROSS-LINKED TO A DEGREE OF FROM 0.001 TO 0.3 MOLAR PERCENT OF CROSS-LINKING UNITS BY A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF DIVINYL BENZENE, METHYLENEBISACRYLAMIDE, DIALLYLPHTHALATE, DIALLYLMALEATE, ETHYLENE ACRYLATE, ETHYLENE DIACRYLATE AND TRIACRYLYLPERHYDROTRIAZINE.
Claim 2
Dependent Claim
122 words
A FIBER-FORMING COMPOSITION OF MATTER WHICH IS SOLUBLE IN A POLYMER SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAIDE, DIMETHYLACETAMIDE, DIMETHYLSULFOXIDE, BUTYROLACETONE, ETHYLENE CARBONATE AND DIMETHYL METHOXYACETAMIDE COMPRISING AN ACRYLONITRILE COPOLYMER CONTAINING AT LEAST 85 MOLAR PERCENT OF ACRYLONITRILE UNITS AND UP TO ABOUT 15 MOLAR PERCENT OF A MONOETHYLENICALLY UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL ACETATE, VINYL CHLORIDE, VINYLIDENE CHLORIDE, ACRYLIC ACID, ACRYLAMIDE, METHACRYLONITRILE, METHACRYLAMIDE AND AN ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID, AND CROSS-LINKED TO A DEGREE OF FROM 0.001 TO 0.3 MOLAR PERCENT OF CROSS-LINKING UNITS BY A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF DIVINYL BENZENE, METHYLENEBISACRYLAMIDE, DIALLYLPHTHALATE, DIALLYLMALEATE, ETHYLENE ACRYLATE, ETHYLENE DIACRYLATE AND TRIACRYLYLPERHYDROTRIAZINE.
References Cited (Backward Citations)
US2332895A
Cited
US2517694A
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US2546238A
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US2596945A
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US2537030A
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US2550652A
Cited
US2715763A
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US2678924A
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US2716586A
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US2723900A
Cited
US2701244A
Cited
US2908659A
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US2810716A
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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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |