US2967085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of wet-spinning fibers containing polyacrylonitrile
Assignee: Kemanord AB
•
Filing: 1957-05-29
•
Granted: 1961-01-03
•
Expires: 1977-05-29
Abstract
No abstract record available.
Inventors
- 👤 Sunden Olof
- 👤 Sonnerskog Sven Hugo
- 👤 Sunden Nils Barthold
- 👤 Larsson Hans Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F13/00; D01F13/04; D01F6/28; D01F6/38; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS OF PRODUCING SYNTHETIC FIBER WHICH COMPRISES SPINNING A SOLUTION OF FROM ABOUT 10% TO ABOUT 30% OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONTRILE AND COPOLYMERS THEREOF WITH FROM 0 TO 15% OF COMONOMERS, AND POLYMERS HAVING A MOLECULAR WEIGHT WITHIN THE RANGE FROM 40,000 TO 200,000 AS CALCULATED FROM VISCOSITY MEASUREMENTS BY THE STAUDINGER EQUATION, IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE AND DIMETHYLACETAMIDE INTO A COAGULATING BATH CONSISTING OF KEROSENE AT A TEMPERATURE WITHIN THE RANGE FROM 60*C. TO 180*C., SAID KEROSENE CONTAINING NOT MORE THAN ABOUT 35% OF AROMATIC HYDRACARBONS.
Claim 2
Dependent Claim
100 words
A PROCESS OF PRODUCING SYNTHETIC FIBER WHICH COMPRISES SPINNING A SOLUTION OF FROM ABOUT 10% TO ABOUT 30% OF A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONTRILE AND COPOLYMERS THEREOF WITH FROM 0 TO 15% OF COMONOMERS, AND POLYMERS HAVING A MOLECULAR WEIGHT WITHIN THE RANGE FROM 40,000 TO 200,000 AS CALCULATED FROM VISCOSITY MEASUREMENTS BY THE STAUDINGER EQUATION, IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLFORMAMIDE AND DIMETHYLACETAMIDE INTO A COAGULATING BATH CONSISTING OF KEROSENE AT A TEMPERATURE WITHIN THE RANGE FROM 60*C. TO 180*C., SAID KEROSENE CONTAINING NOT MORE THAN ABOUT 35% OF AROMATIC HYDRACARBONS.
References Cited (Backward Citations)
US2644796A
Cited
US2570200A
Cited
US2688010A
Cited
US2570257A
Cited
US2777751A
Cited
US2688012A
Cited
FR1048381A
Cited
US2749316A
Cited
US2775507A
Cited
US2764468A
Cited
US2806831A
Cited
US2798887A
Cited
US2771490A
Cited
US2902335A
Cited
US2798059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |