Patent US2962342A successfully refreshed from Google Patents.
US2962342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing viscose rayon
Assignee: Akzo Nobel UK PLC
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Filing: 1956-12-17
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Granted: 1960-11-29
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Byron A Thumm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:45
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
IN A METHOD OF PRODUCING SHAPED BODIES OF REGENERATED CELLULOSE CONSISTING SUBSTANTIALLY ENTIRELY OF SKIN, THE STEPS WHICH INCLUDE EXTRUDING A VISCOSE HAVING A SALT INDEX OF AT LEAST 6 AND CONTAINING FROM ABOUT 4 PERCENT TO 10 PERCENT CELLULOSE, FROM ABOUT 4 PERCENT TO 11 PERCENT CAUSTIC SODA, FROM ABOUT 32 PERCENT TO 60 PERCENT CARBON DISULFIDE BASED ON THE WEIGHT OF THE CELLULOSE AND FROM ABOUT 0.2 PERCENT TO ABOUT 4 PERCENT, BASED ON THE WEIGHT OF THE CELLULOSE, OF AN ALKALI-SOLUBLE POLYOXYALKYLENE GLYCOL ETHER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CASTOR OIL, HYDROGENATED CASTOR OIL AND MIXTURES OF CASTOR OIL AND HYDROGENATED CASTOR OIL INTO AN AQUEOUS SPINNING BATH CONTAINING FROM ABOUT 10 PERCENT TO 25 PERCENT SODIUM SULFATE, FROM ABOUT 4 PERCENT TO 15 PERCENT ZINC SULFATE AND SULFURIC ACID, THE PERCENT SULFURIC ACID CONTENT OF THE SPINNING BATH EXCEEDING THE SLUBBING POINT BUT NOT EXCEEDING APPROXIMATELY 0.25 TIMES THE PERCENT CARBON DISULFIDE CONTENT OF THE VISCOSE, BASED ON THE WEIGHT OF THE CELLULOSE IN THE VISCOSE.
Claim 2
Dependent Claim
174 words
IN A METHOD OF PRODUCING SHAPED BODIES OF REGENERATED CELLULOSE CONSISTING SUBSTANTIALLY ENTIRELY OF SKIN, THE STEPS WHICH INCLUDE EXTRUDING A VISCOSE HAVING A SALT INDEX OF AT LEAST 6 AND CONTAINING FROM ABOUT 4 PERCENT TO 10 PERCENT CELLULOSE, FROM ABOUT 4 PERCENT TO 11 PERCENT CAUSTIC SODA, FROM ABOUT 32 PERCENT TO 60 PERCENT CARBON DISULFIDE BASED ON THE WEIGHT OF THE CELLULOSE AND FROM ABOUT 0.2 PERCENT TO ABOUT 4 PERCENT, BASED ON THE WEIGHT OF THE CELLULOSE, OF AN ALKALI-SOLUBLE POLYOXYALKYLENE GLYCOL ETHER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CASTOR OIL, HYDROGENATED CASTOR OIL AND MIXTURES OF CASTOR OIL AND HYDROGENATED CASTOR OIL INTO AN AQUEOUS SPINNING BATH CONTAINING FROM ABOUT 10 PERCENT TO 25 PERCENT SODIUM SULFATE, FROM ABOUT 4 PERCENT TO 15 PERCENT ZINC SULFATE AND SULFURIC ACID, THE PERCENT SULFURIC ACID CONTENT OF THE SPINNING BATH EXCEEDING THE SLUBBING POINT BUT NOT EXCEEDING APPROXIMATELY 0.25 TIMES THE PERCENT CARBON DISULFIDE CONTENT OF THE VISCOSE, BASED ON THE WEIGHT OF THE CELLULOSE IN THE VISCOSE.
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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |