US2967086A
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 00:30
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
144 words
IN WET SPINNING A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND COPOLYMERS THEREOF WITH FROM 0 TO 15% OF COMONOMERS, THE CYCLE COMPRISING THE STEPS, DISSOLVING SAID POLYMER IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLSULFOXIDE, ETHYLENE CARBONATE AND PROPYLENE CARBONATE, EXTRUDING THE RESULTING SOLUTION INTO A COAGULATING BATH CONSISTING ESSENTIALLY OF KEROSENE CONTAINING 50-75% BY WEIGHT OF AROMATIC HYDROCARBONS BASED UPON THE WEIGHT OF THE KEROSENE AT A TEMPERATURE WITHIN THE RANGE FROM 60*C. TO 160*C. THEREBY EXTRACTING SAID SOLVENT OUT OF THE EXTRUDED SOLUTION INTO SAID COAGULATING BATH, COOLING SAID COAGULATING BATH CONTAINING THE EXTRACTED SOLVENT AT LEAST 40*C., SEPARATING THE RESULTING TWO LIQUID PHASES, DISTILLING THE LOWER OF SAID TWO PHASES TO SEPARATE ITS SOLVENT CONTENT FROM KEROSENE AND GUMMY AND COLORED IMPURITIES AND DISSOLVING MORE POLYACRYLONITRILE IN SAID RECOVERED SOLVENT IN A REPETITION OF THE CYCLE.
Claim 2
Dependent Claim
144 words
IN WET SPINNING A POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND COPOLYMERS THEREOF WITH FROM 0 TO 15% OF COMONOMERS, THE CYCLE COMPRISING THE STEPS, DISSOLVING SAID POLYMER IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIMETHYLSULFOXIDE, ETHYLENE CARBONATE AND PROPYLENE CARBONATE, EXTRUDING THE RESULTING SOLUTION INTO A COAGULATING BATH CONSISTING ESSENTIALLY OF KEROSENE CONTAINING 50-75% BY WEIGHT OF AROMATIC HYDROCARBONS BASED UPON THE WEIGHT OF THE KEROSENE AT A TEMPERATURE WITHIN THE RANGE FROM 60*C. TO 160*C. THEREBY EXTRACTING SAID SOLVENT OUT OF THE EXTRUDED SOLUTION INTO SAID COAGULATING BATH, COOLING SAID COAGULATING BATH CONTAINING THE EXTRACTED SOLVENT AT LEAST 40*C., SEPARATING THE RESULTING TWO LIQUID PHASES, DISTILLING THE LOWER OF SAID TWO PHASES TO SEPARATE ITS SOLVENT CONTENT FROM KEROSENE AND GUMMY AND COLORED IMPURITIES AND DISSOLVING MORE POLYACRYLONITRILE IN SAID RECOVERED SOLVENT IN A REPETITION OF THE CYCLE.
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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) | 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 |