Patent US2811409A successfully refreshed from Google Patents.
US2811409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinning of acrylonitrile polymer fibers
Assignee: Eastman Kodak Co
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Filing: 1952-12-31
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Granted: 1957-10-29
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Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Clapp John William
- 👤 Charles B Mather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:39
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/229; D01; D01D; D01D5/00; D01D5/04; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF FORMING YARN FROM A SPINNING SOLUTION CONTAINING IN DIMETHYL FORMAMIDE AT LEAST 18% OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE, A GRAFT POLYMER OF ACRYLONITRILE AND N-METHYLMETHACRYLAMIDE CONTAINING 18% OF THE LATTER COMPOUND, A GRAFT POLYMER OF ACRYLONITRILE A N-ISOPROPYL ACRYLAMIDE CONTAINING 18% OF THE LATTER COMPOUND WHICH COMPRISES HEATING THE SOLUTION TO A TEMPERATURE WITHIN THE RANGE OF 100-170*C., CONTINUOUSLY EXTRUDING THE HOT SOLUTION THROUGH A SPINNERET INTO A SPINNING CELL TO FORM FILAMNETS, BLOWING GAS HEATED TO A TEMPERATURE WITHIN THE RANGE OF 150 TO 400*C. ACROSS THE FILAMENTS ADJACENT THE FACE OF THE SPINNERET, DRYING THE FILAMENTS BY CONDUCTCELL MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF 70 TO 200*C., THEN CONDUCTING THE FILAMENTS SECONDLY THROUGH A SECOND SECTION OF THE SPINNING CELL MAINTAINED
Claim 2
Independent Claim
133 words
THE METHOD OF FORMING YARN FROM A SPINNING SOLUTION CONTAINING IN DIMETHYL FORMAMIDE AT LEAST 18% OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE, A GRAFT POLYMER OF ACRYLONITRILE AND N-METHYLMETHACRYLAMIDE CONTAINING 18% OF THE LATTER COMPOUND, A GRAFT POLYMER OF ACRYLONITRILE A N-ISOPROPYL ACRYLAMIDE CONTAINING 18% OF THE LATTER COMPOUND WHICH COMPRISES HEATING THE SOLUTION TO A TEMPERATURE WITHIN THE RANGE OF 100-170*C., CONTINUOUSLY EXTRUDING THE HOT SOLUTION THROUGH A SPINNERET INTO A SPINNING CELL TO FORM FILAMNETS, BLOWING GAS HEATED TO A TEMPERATURE WITHIN THE RANGE OF 150 TO 400*C. ACROSS THE FILAMENTS ADJACENT THE FACE OF THE SPINNERET, DRYING THE FILAMENTS BY CONDUCTCELL MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF 70 TO 200*C., THEN CONDUCTING THE FILAMENTS SECONDLY THROUGH A SECOND SECTION OF THE SPINNING CELL MAINTAINED
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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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |