Patent US2902335A successfully refreshed from Google Patents.
US2902335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic fiber preparation
Assignee: Individual
•
Filing: 1955-08-16
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Granted: 1959-09-01
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Expires: 1975-08-16
Abstract
No abstract record available.
Inventors
- 👤 Sakurai Ryoichi
- 👤 Tanabe Takashi
- 👤 Nagao Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
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
78 words
A PROCESS FOR WET SPINNING OF ACRYLIC NITRILE SYNTHETIC FIBER WHICH COMPRISES EXTRUDING A SOLUTION PREPARED BY DISSOLVING ACRYLIC NITRILE POLYMERS IN DIMETHYLFORMAMIDE, INTO A 20 TO 55% BY WEIGHT AQUEOUS SOLUTION OF OF POTASSIUM CARBONATE, COOLING THE AQUEOUS SOLUTION OF DIMETHYLFORMAMIDE AND POTASSIUM CARBONATE TO FORM TWO PHASES, ONE PHASE BEING RICH IN DIMETHYLFORMAMIDE AND THE OTHER PHASE BEING RICH IN POTASSIUM CARBONATE, AND REUSING THE POTASSIUM CARBONATE PHASE IN THE EXTRUSION OF THE ACRYLIC NITRILE POLYMER.
Claim 2
Dependent Claim
78 words
A PROCESS FOR WET SPINNING OF ACRYLIC NITRILE SYNTHETIC FIBER WHICH COMPRISES EXTRUDING A SOLUTION PREPARED BY DISSOLVING ACRYLIC NITRILE POLYMERS IN DIMETHYLFORMAMIDE, INTO A 20 TO 55% BY WEIGHT AQUEOUS SOLUTION OF OF POTASSIUM CARBONATE, COOLING THE AQUEOUS SOLUTION OF DIMETHYLFORMAMIDE AND POTASSIUM CARBONATE TO FORM TWO PHASES, ONE PHASE BEING RICH IN DIMETHYLFORMAMIDE AND THE OTHER PHASE BEING RICH IN POTASSIUM CARBONATE, AND REUSING THE POTASSIUM CARBONATE PHASE IN THE EXTRUSION OF THE ACRYLIC NITRILE POLYMER.
References Cited (Backward Citations)
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US2544385A
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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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |