Patent US2974004A successfully refreshed from Google Patents.
US2974004A
Expired / Lapsed
US
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Production of shaped objects from viscose
Assignee: Akzona Inc
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Filing: 1955-10-17
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Granted: 1961-03-07
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Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Heuer Kurt
- 👤 Elling Hugo
- 👤 Elssner Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A PROCESS FOR THE PRODUCTION OF REGENERATED CELLULOSE THREADS FROM VISCOSE, COMPRISING INCORPORATING INTO VISCOSE 0.06-0.4% BY WEIGHT BASED ON THE VISCOSE OF IMIDAZOLE, EXTRUDING THE RESULTING VISCOSE INTO AN AQUEOUS BATH HAVING THE COMPOSITION OF 30-50 G./1. OF ZINC SULPHATE AND 40-65 G./1. OF SULPHURIC ACID, TREATING THE RESULTING EXTRUDED OBJECT IN A SECOND HOT BATH CONTAINING 2-10 G./1. OF SULPHURIC ACID, AND STRETCHING SAME BY A FACTOR OF 80-120%.
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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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |