US2705183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscose spinning process
Assignee: Akzo Nobel UK PLC
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Filing: 1952-03-08
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Granted: 1955-03-29
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Expires: 1972-03-08
Abstract
No abstract record available.
Inventors
- 👤 Robert R James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:10
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
THE METHOD OF MAKING REGENERATED CELLULOSE FILAMENTS WHICH COMPRISES EXTRUDING VISCOSE CONTAINING FROM 6 TO 8% SODIUM HYDROXIDE AND 7 TO 9% CELLULOSE, AND HAVING A SODIUM CHLORIDE SALT TEST VALUE OF 4 TO 8 UPWARDLY THROUGH A SPINNERET INTO AN AQUEOUS COAGULATING AND REGENERATING LIQUID TO FORM FILAMENTS, SAID LIQUID COMPRISING A RELATIVELY QUIESCENT PORTION IN THE NEIGHBORHOOD OF THE SPINNERET AND A COUNTERCURRENTLY FLOWING PORTION APPLIED TO THE FILAMENTS AT A POINT SPACED FROM THE SPINNERET, THE RELATIVELY QUIESCENT PORTION OF THE LIQUID COMPRISING AN AQUEOUS SOLUTION OF FROM 2 TO 5% SULFURIC ACID, FROM 8 TO 12% ZINC SULFATE AND AN AMOUNT OF SODIUM SULFATE BETWEEN 18% AND THE SATURATION LIMIT, AND THE COUNTERCURRENTLY FLOWING PORTION OF THE LIQUID COMPRISING, AT ITS POINT OF SUPPLY TO THE FILAMENTS, AN AQUEOUS SOLUTION OF 8 TO 12% SULFURIC ACID, 8 TO 12% ZINC SULFATE, AND AT LEAST 18% SODIUM SULFATE, THE FILAMENTS BEING IN CONTACT WITH THE COUNTERCURRENTLY FLOWING PORTION OF THE LIQUID FOR A TIME INTERVAL BETWEEN ONETHIRD OF A SECOND AND THREE SECONDS.
Claim 2
Independent Claim
176 words
THE METHOD OF MAKING REGENERATED CELLULOSE FILAMENTS WHICH COMPRISES EXTRUDING VISCOSE CONTAINING FROM 6 TO 8% SODIUM HYDROXIDE AND 7 TO 9% CELLULOSE, AND HAVING A SODIUM CHLORIDE SALT TEST VALUE OF 4 TO 8 UPWARDLY THROUGH A SPINNERET INTO AN AQUEOUS COAGULATING AND REGENERATING LIQUID TO FORM FILAMENTS, SAID LIQUID COMPRISING A RELATIVELY QUIESCENT PORTION IN THE NEIGHBORHOOD OF THE SPINNERET AND A COUNTERCURRENTLY FLOWING PORTION APPLIED TO THE FILAMENTS AT A POINT SPACED FROM THE SPINNERET, THE RELATIVELY QUIESCENT PORTION OF THE LIQUID COMPRISING AN AQUEOUS SOLUTION OF FROM 2 TO 5% SULFURIC ACID, FROM 8 TO 12% ZINC SULFATE AND AN AMOUNT OF SODIUM SULFATE BETWEEN 18% AND THE SATURATION LIMIT, AND THE COUNTERCURRENTLY FLOWING PORTION OF THE LIQUID COMPRISING, AT ITS POINT OF SUPPLY TO THE FILAMENTS, AN AQUEOUS SOLUTION OF 8 TO 12% SULFURIC ACID, 8 TO 12% ZINC SULFATE, AND AT LEAST 18% SODIUM SULFATE, THE FILAMENTS BEING IN CONTACT WITH THE COUNTERCURRENTLY FLOWING PORTION OF THE LIQUID FOR A TIME INTERVAL BETWEEN ONETHIRD OF A SECOND AND THREE SECONDS.
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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |