US2937070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscose process
Assignee: EIDP Inc
•
Filing: 1955-08-02
•
Granted: 1960-05-17
•
Expires: 1975-08-02
Abstract
No abstract record available.
Inventors
- 👤 Cox Norman Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR THE PRODUCTION OF HIGH TENACITY REGENERATED CELLULOSE FILAMENTS WHICH COMPRISES EXTRUDING A XANTHATED VISCOSE SPINNING SOLUTION, THE XANTHATED VISCOSE CONTAINING AT LEAST 23% XANTHATE SULFUR BASED ON THE CELLULOSE CONTENT, THROUGH A PLURALITY OF ORIFICES INTO AN AQUEOUS COAGULATING BATH FREE OF HEAVY METALY SALTS AND CONTAINING BY WEIGHT ABOUT 0.2% TO 1.0% FORMALDEHYDE, FROM 2% TO 11% SULFURIC ACID AND UP TO 12% SODIUM SULFATE, THE SUM OF SULFURIC ACID AND SODIUM SULFATE CONCENTRATIONS BEING FROM 8% TO 16%, TO FORM FILAMENTS CONTAINING AT LEAST 70% OF THE XANTHATE GROUPS ORIGINALLY PRESENT IN THE VISCOSE, AND STRETCHING THE COAGULATED FILAMENTS AT LEAST 300% WHILE PASSING THEM THROUGH AT LEAST ONE AQUEOUS REGENERATING BATH CONTAINING A MAJOR PERCENTAGE OF WATER AND A MINOR PERCENTAGE OF SULFURIC ACID.
Claim 2
Dependent Claim
130 words
A PROCESS FOR THE PRODUCTION OF HIGH TENACITY REGENERATED CELLULOSE FILAMENTS WHICH COMPRISES EXTRUDING A XANTHATED VISCOSE SPINNING SOLUTION, THE XANTHATED VISCOSE CONTAINING AT LEAST 23% XANTHATE SULFUR BASED ON THE CELLULOSE CONTENT, THROUGH A PLURALITY OF ORIFICES INTO AN AQUEOUS COAGULATING BATH FREE OF HEAVY METALY SALTS AND CONTAINING BY WEIGHT ABOUT 0.2% TO 1.0% FORMALDEHYDE, FROM 2% TO 11% SULFURIC ACID AND UP TO 12% SODIUM SULFATE, THE SUM OF SULFURIC ACID AND SODIUM SULFATE CONCENTRATIONS BEING FROM 8% TO 16%, TO FORM FILAMENTS CONTAINING AT LEAST 70% OF THE XANTHATE GROUPS ORIGINALLY PRESENT IN THE VISCOSE, AND STRETCHING THE COAGULATED FILAMENTS AT LEAST 300% WHILE PASSING THEM THROUGH AT LEAST ONE AQUEOUS REGENERATING BATH CONTAINING A MAJOR PERCENTAGE OF WATER AND A MINOR PERCENTAGE OF SULFURIC ACID.
References Cited (Backward Citations)
GB557218A
Cited
US2452130A
Cited
US2512968A
Cited
US2535044A
Cited
US2594496A
Cited
US2787517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |