US2796319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscose spinning process
Assignee: Viscosuisse SA
•
Filing: 1955-04-04
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Granted: 1957-06-18
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Studer Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:02
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
PROCESS FOR THE PRODUCTION OF FIBRES, FILAMENTS, BRISTLES, STRIPS AND FOILS WHICH COMPRISES EXTRUDING THROUGH A SUITABLY SHAPED ORIFICE, A VISCOSE SOLUTION HAVING A DEGREE OF XANTHANTION OF 0.25 TO 0.45 AND WHICH THE CELLULOSE HAS A DEGREE OF POLYMERISATION OF AT LEAST 400 INTO AN AQUEOUS COAGULATING BATH CONTAINING FROM 50 TO 75% OF CAUSTIC ALKALI, AT A TEMPERATURE OF 50-100* C., DECOMPOSING THE XANTHATE PRODUCTS BY THE ACTION OF HEAT, WASHING THEM FREE FROM CAUSTIC ALKALI, STRETCHING AND DRYING THEM.
Claim 2
Dependent Claim
82 words
PROCESS FOR THE PRODUCTION OF FIBRES, FILAMENTS, BRISTLES, STRIPS AND FOILS WHICH COMPRISES EXTRUDING THROUGH A SUITABLY SHAPED ORIFICE, A VISCOSE SOLUTION HAVING A DEGREE OF XANTHANTION OF 0.25 TO 0.45 AND WHICH THE CELLULOSE HAS A DEGREE OF POLYMERISATION OF AT LEAST 400 INTO AN AQUEOUS COAGULATING BATH CONTAINING FROM 50 TO 75% OF CAUSTIC ALKALI, AT A TEMPERATURE OF 50-100* C., DECOMPOSING THE XANTHATE PRODUCTS BY THE ACTION OF HEAT, WASHING THEM FREE FROM CAUSTIC ALKALI, STRETCHING AND DRYING THEM.
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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |