US3351696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing regenerated cellulose products
Assignee: CTA CIE IND DE TEXTILES ARTIFI
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Filing: 1963-07-18
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Granted: 1967-11-07
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Expires: 1983-07-18
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:38
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/02; D01F2/00; D01F2/06; D01F2/08; D01F2/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A PROCESS FOR THE PRODUCTION OF FILAMENTS OF REGENERATED CELLULOSE HAVING A VERY HIGH TENACITY BOTH IN THE CONDITIONED STATE AND IN THE WET STATE, GOOD DIMENSIONAL STABILITY, A HIGH MODULUS OF ELASTICITY IN THE WET STATE, WHICH COMPRISES SPINNING A VISCOSE WHICH CONTAINS A CELLULOSE WHOSE DP IS EQUAL TO AL LEAST 500, AND HAVING A VISCOSITY OF 150 POISES TO 1000 POISES AND A GAMMA NUMBER OF >45 TO 100 INTO A FIRST BATH CONTAINING LESS THAN 60 GRAMS PER LITER OF SULPHURIC ACID, 10 TO 120 GRAMS PER LITER OF SODIUM SULPHATE AND LESS THAN 1% ZINC SULPHATE TO PRODUCE FILAMENTS, INTRODUCING THE FILAMENTS SO FORMED INTO AN INTERMEDIATE BATH CONTAINING FROM 1 TO 40 GRAMS PER LITER OF AN ALDEHYDE, INTRODUCING THE FILAMENTS FROM SAID INTERMEDIATE BATH INTO A SECOND HOT REGENERATIVE BATH AND STRETCHING SAID FILAMENTS 100% OF THEIR LENGTH AT A STAGE PRIOR TO REMOVAL FROM SAID SECOND BATH, AND FIXING SAID STRETCHED FILAMENTS.
Claim 2
Dependent Claim
160 words
A PROCESS FOR THE PRODUCTION OF FILAMENTS OF REGENERATED CELLULOSE HAVING A VERY HIGH TENACITY BOTH IN THE CONDITIONED STATE AND IN THE WET STATE, GOOD DIMENSIONAL STABILITY, A HIGH MODULUS OF ELASTICITY IN THE WET STATE, WHICH COMPRISES SPINNING A VISCOSE WHICH CONTAINS A CELLULOSE WHOSE DP IS EQUAL TO AL LEAST 500, AND HAVING A VISCOSITY OF 150 POISES TO 1000 POISES AND A GAMMA NUMBER OF >45 TO 100 INTO A FIRST BATH CONTAINING LESS THAN 60 GRAMS PER LITER OF SULPHURIC ACID, 10 TO 120 GRAMS PER LITER OF SODIUM SULPHATE AND LESS THAN 1% ZINC SULPHATE TO PRODUCE FILAMENTS, INTRODUCING THE FILAMENTS SO FORMED INTO AN INTERMEDIATE BATH CONTAINING FROM 1 TO 40 GRAMS PER LITER OF AN ALDEHYDE, INTRODUCING THE FILAMENTS FROM SAID INTERMEDIATE BATH INTO A SECOND HOT REGENERATIVE BATH AND STRETCHING SAID FILAMENTS 100% OF THEIR LENGTH AT A STAGE PRIOR TO REMOVAL FROM SAID SECOND BATH, AND FIXING SAID STRETCHED FILAMENTS.
References Cited (Backward Citations)
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US2974363A
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US2979767A
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US3038778A
Cited
US3007766A
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US3139467A
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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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |