Patent US2594496A successfully refreshed from Google Patents.
US2594496A
Expired / Lapsed
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Method of making artificial fibers or threads from viscose
Assignee: Akzo Nobel UK PLC
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Filing: 1949-04-12
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Granted: 1952-04-29
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Expires: 1969-04-12
Abstract
No abstract record available.
Inventors
- 👤 Jr George A Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:57
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE MANUFACTURE OF ARTIFICAL FIBERS FROM VISCOSE, THE STEPS WHICH COMPRISE EXTRUDING THE VISCOSE INTO AN ESSENTIALLY AQUEOUS COAGULATING MEDIUM WHICH IS NOT A CELLULOSE REGENERATING MEDIUM AND WHICH CONTAINS FROM 1 TO 20% BY WEIGHT OF ACETIC ACID AND FROM 5 TO 30% BY WEIGHT OF SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFATE, SODIUM ACETATE AND MIXTURES OF SODIUM SULFATE AND SODIUM ACETATE, THE TOTAL CONCENTRATION OF SALT AND ACETIC ACID BEING AT LEAST 15% WEIGHT, WITHDRAWING THE CONTINUOUS FILAMENTS OF CELLULOSE XANTHATE THUS OBTAINED FROM THE BATH, AND STRETCHING THE FILAMENTS.
Claim 2
Dependent Claim
96 words
IN THE MANUFACTURE OF ARTIFICAL FIBERS FROM VISCOSE, THE STEPS WHICH COMPRISE EXTRUDING THE VISCOSE INTO AN ESSENTIALLY AQUEOUS COAGULATING MEDIUM WHICH IS NOT A CELLULOSE REGENERATING MEDIUM AND WHICH CONTAINS FROM 1 TO 20% BY WEIGHT OF ACETIC ACID AND FROM 5 TO 30% BY WEIGHT OF SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM SULFATE, SODIUM ACETATE AND MIXTURES OF SODIUM SULFATE AND SODIUM ACETATE, THE TOTAL CONCENTRATION OF SALT AND ACETIC ACID BEING AT LEAST 15% WEIGHT, WITHDRAWING THE CONTINUOUS FILAMENTS OF CELLULOSE XANTHATE THUS OBTAINED FROM THE BATH, AND STRETCHING THE FILAMENTS.
References Cited (Backward Citations)
US792888A
Cited
US2328307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |