US2986446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crimped regenerated cellulose fibres
Assignee: Akzo Nobel UK PLC
•
Filing: 1957-07-25
•
Granted: 1961-05-30
•
Expires: 1977-07-25
Abstract
No abstract record available.
Inventors
- 👤 Smith John Oliver
- 👤 Gardner Brian Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:42
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/298
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR THE PRODUCTION OF REGENERATED CELLULOSE FIBERS HAVING A HIGH DEGREE OF CRIMP, COMPRISING THE STEPS OF EXTRUDING VISCOSE CONTAINING FROM 5 PERCENT TO 10 PERCENT CELLULOSE, FROM 5 PERCENT TO 10 PERCENT CAUSTIC SODA, AT A SALT FIGURE OF FROM 3 TO 14, INTO A COAGULATING AND REGENERATING BATH CONTAINING BETWEEN 5 PERCENT AND 14 PERCENT SULPHURIC ACID, 0.5 PERCENT AND 3 PERCENT ZINC SULPHATE AND MORE THAN 12 PERCENT SODIUM SULPHATE, IN THE PRESENCE OF MORE THAN 0.05 PERCENT OF THE WEIGHT OF THE VISCOSE OF POLYOXYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF BETWEEN 600 AND 6,000, SUBJECTING THE FILAMENTS TO AT LEAST A 50 PERCENT STRETCH, AND RELAXING SAID FILAMENTS.
Claim 2
Dependent Claim
116 words
A PROCESS FOR THE PRODUCTION OF REGENERATED CELLULOSE FIBERS HAVING A HIGH DEGREE OF CRIMP, COMPRISING THE STEPS OF EXTRUDING VISCOSE CONTAINING FROM 5 PERCENT TO 10 PERCENT CELLULOSE, FROM 5 PERCENT TO 10 PERCENT CAUSTIC SODA, AT A SALT FIGURE OF FROM 3 TO 14, INTO A COAGULATING AND REGENERATING BATH CONTAINING BETWEEN 5 PERCENT AND 14 PERCENT SULPHURIC ACID, 0.5 PERCENT AND 3 PERCENT ZINC SULPHATE AND MORE THAN 12 PERCENT SODIUM SULPHATE, IN THE PRESENCE OF MORE THAN 0.05 PERCENT OF THE WEIGHT OF THE VISCOSE OF POLYOXYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF BETWEEN 600 AND 6,000, SUBJECTING THE FILAMENTS TO AT LEAST A 50 PERCENT STRETCH, AND RELAXING SAID FILAMENTS.
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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |