US3002803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of spinning low elongation viscose rayon
Assignee: Akzona Inc
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Filing: 1957-07-22
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Granted: 1961-10-03
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Expires: 1977-07-22
Abstract
Abstract Threads of reduced or regulated elongation are produced by spinning viscose in a bath containing 2-7 per cent by weight of sulphuric acid, 5-20 per cent by weight of sodium sulphate and 2-15 per cent by weight of zinc sulphate at a temperature of at least 20 DEG C. but below 40 DEG C. and stretching the threads either in the spinning bath itself or in a subsequent, more dilute, bath which is at the same temperature as, or a higher temperature than, the first bath. When stretching is carried out in a second, more dilute, bath this may be maintained at 50-70 DEG C.
Inventors
- 👤 Daimler Berthold
- 👤 Elling Hugo
- 👤 Elssner Richard
- 👤 Heuer Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:06
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 0
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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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |