US2948581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a synthetic fiber
Assignee: Wyeth Holdings LLC
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Filing: 1955-12-20
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Granted: 1960-08-09
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Expires: 1975-12-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Percival W Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:29
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
THE METHOD OF PRODUCING A POLYACRYLONITRILE FILAMENTARY MATERIAL WHICH INCLUDES THE STEPS OF STRETCHING AN UNWASHED, WET-SPUN GELLED, POLYACRYLONITRILE FILAMENTARY MATERIAL, DIRECTLY AFTER REMOVAL FROM THE COAGULATING BATH IN WHICH IT WAS FORMED, AT A TEMPERATURE OF FROM ABOUT -2*C. TO ABOUT 40*C. TO BETWEEN ONE AND ONE-HALF AND FOUR TIMES ITS ORIGINAL LENGTH, SAID GELLED, POLYACRYLONITRILE FILAMENTARY MATERIAL CONTAINING WATER, AND ALSO AN ALKALI-METAL THIOCYANATE IN AN AMOUNT CORRESPONDING TO, ON NET-DRY BASIS, FROM ONE-HALF TO TWICE THE WEIGHT OF THE NET-DRY ACRYLONITRILE POLYMER THAT IS PRESENT IN THE SAID FILAMENTARY MATERIAL, TREATING THE THUSLY STRETCHED FILAMENTARY MATERIAL FOR THE REMOVAL OF THIOCYANATE THEREFROM, STRETCHING THE TREATED FILAMENTARY MATERIAL A SECOND TIME TO BETWEEN ONE AND ONE-HALF AND TEN TIMES ITS ONCE-STRETCHED LENGTH, THE SECOND STRETCH BEING CORRELATED WITH THE FIRST STRETCH SO THAT THE TOTAL STRETCH IS TO FROM THREE TO FIFTEEN TIMES THE LENGTH OF THE SAID FILAMENTARY MATERIAL IMMEDIATELY BEFORE THE FIRST STRETCH, SAID SECOND STRETCH BEING EFFECTED WHILE THE SAID FILAMENTARY MATERIAL IS IN CONTACT WITH MOISTURE AND AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 70*C. TO ABOUT
Claim 2
Independent Claim
184 words
THE METHOD OF PRODUCING A POLYACRYLONITRILE FILAMENTARY MATERIAL WHICH INCLUDES THE STEPS OF STRETCHING AN UNWASHED, WET-SPUN GELLED, POLYACRYLONITRILE FILAMENTARY MATERIAL, DIRECTLY AFTER REMOVAL FROM THE COAGULATING BATH IN WHICH IT WAS FORMED, AT A TEMPERATURE OF FROM ABOUT -2*C. TO ABOUT 40*C. TO BETWEEN ONE AND ONE-HALF AND FOUR TIMES ITS ORIGINAL LENGTH, SAID GELLED, POLYACRYLONITRILE FILAMENTARY MATERIAL CONTAINING WATER, AND ALSO AN ALKALI-METAL THIOCYANATE IN AN AMOUNT CORRESPONDING TO, ON NET-DRY BASIS, FROM ONE-HALF TO TWICE THE WEIGHT OF THE NET-DRY ACRYLONITRILE POLYMER THAT IS PRESENT IN THE SAID FILAMENTARY MATERIAL, TREATING THE THUSLY STRETCHED FILAMENTARY MATERIAL FOR THE REMOVAL OF THIOCYANATE THEREFROM, STRETCHING THE TREATED FILAMENTARY MATERIAL A SECOND TIME TO BETWEEN ONE AND ONE-HALF AND TEN TIMES ITS ONCE-STRETCHED LENGTH, THE SECOND STRETCH BEING CORRELATED WITH THE FIRST STRETCH SO THAT THE TOTAL STRETCH IS TO FROM THREE TO FIFTEEN TIMES THE LENGTH OF THE SAID FILAMENTARY MATERIAL IMMEDIATELY BEFORE THE FIRST STRETCH, SAID SECOND STRETCH BEING EFFECTED WHILE THE SAID FILAMENTARY MATERIAL IS IN CONTACT WITH MOISTURE AND AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 70*C. TO ABOUT
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) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |