US2966391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of regenerated cellulose fibers
Assignee: Spinnfaser AG
•
Filing: 1956-10-04
•
Granted: 1960-12-27
•
Expires: 1976-10-04
Abstract
No abstract record available.
Inventors
- 👤 Werner Bandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:06
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01D; D01D5/00; D01D5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PROCESS FOR MANUFACTURE FROM VISCOSE OF REGENERATED CELLULOSE FIBERS WITH HIGH CRIMPING PROPERTIES AND HIGH STRETCHING AND ABRASION RESISTANCE VALUES WHICH COMPRISES: SPINNING UNRIPE VISCOSE HAVING A RIPENESS VALUE OF AT LEAST 14*H. IN AN ACID SPINNING BATH MAINTAINED AT A TEMPERATURE OVER 65*C. AND BEING HIGH IN SODIUM SULFATE CONTENT, THE BATH CONTAINING A SMALL QUANTITY OF ZINC SULFATE AND HAVING A SPECIFIC GRAVITY OF AT LEAST ABOUT 1.3 AT 43*C., STRETCHING THE FILAMENTS IN A DILUTE ACID BATH, INCOMPLETELY REGENERATING THE CELLULOSE IN THE SPINNING AND STRETCHING STEPS, AND THEREAFTER IMMERSING THE FILAMENTS IN A LAX STATE IN DILUTE ACID TO COMPLETE THE REGENERATION OF THE CELLULOSE.
Claim 2
Dependent Claim
110 words
A PROCESS FOR MANUFACTURE FROM VISCOSE OF REGENERATED CELLULOSE FIBERS WITH HIGH CRIMPING PROPERTIES AND HIGH STRETCHING AND ABRASION RESISTANCE VALUES WHICH COMPRISES: SPINNING UNRIPE VISCOSE HAVING A RIPENESS VALUE OF AT LEAST 14*H. IN AN ACID SPINNING BATH MAINTAINED AT A TEMPERATURE OVER 65*C. AND BEING HIGH IN SODIUM SULFATE CONTENT, THE BATH CONTAINING A SMALL QUANTITY OF ZINC SULFATE AND HAVING A SPECIFIC GRAVITY OF AT LEAST ABOUT 1.3 AT 43*C., STRETCHING THE FILAMENTS IN A DILUTE ACID BATH, INCOMPLETELY REGENERATING THE CELLULOSE IN THE SPINNING AND STRETCHING STEPS, AND THEREAFTER IMMERSING THE FILAMENTS IN A LAX STATE IN DILUTE ACID TO COMPLETE THE REGENERATION OF THE CELLULOSE.
References Cited (Backward Citations)
US2301003A
Cited
US2340377A
Cited
US2312152A
Cited
US2440057A
Cited
US2696423A
Cited
US2852333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |