US3139467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for spinning viscose
Assignee: Chimiotex SA
•
Filing: 1962-11-14
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Granted: 1964-06-30
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Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Herrbach Paul
- 👤 Rodier Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:02
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/06; D01F; D01F2/00; D01F2/06; D01F2/08; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A PROCESS FOR THE MANUFACTURE OF FIBERS OR FILAMENTS HAVING HIGH MECHANICAL CHARACTERISTICS, A STABLE MICROFIBRILLAR STRUCTURE AND GOOD DIMENSIONAL STABILITY, WHICH COMPRISES SPINNING A VISCOSE CONTAINING A CELLULOSE HAVING A DP OF AT LEAST 500 AND A VISCOSITY OF AT LEAST 150 POISES AND A GAMMA INDEX OF AT LEAST 45 WITH A COLD ACID BATH CONTAINING NOT OVER 60 GRAMS OF SULFURIC ACID PER LITER AND FROM 10 TO 120 G./L. SODIUM SULFATE AND SUBSTANTIALLY NO ZINC SULFATE; THE SPINNING TAKING PLACE IN AN UPWARD VERTICAL DIRECTION, AND WHILE THE FILAMENTS ARE STILL INCAPABLE OF SUPPORTING THEMSELVES, CONVEYING SAID FILAMENTS AT THE EXIT OF SAID BATH TANGENTIALLY ON A PARTIALLY IMMERSED HOLLOW ROTATING SURFACE FOR A DISTANCE TO ALLOW PARTIAL EXTRACTION OF THE SAID BATH BY VACUUM THROUGH THE SURFACE AND SIMULTANEOUSLY COAGULATING TO A POINT AT WHICH SAID FILAMENTS BECOME SELF-SUPPORTING AND THEN STRETCHING SAID FILAMENTS IN AIR.
Claim 2
Dependent Claim
151 words
A PROCESS FOR THE MANUFACTURE OF FIBERS OR FILAMENTS HAVING HIGH MECHANICAL CHARACTERISTICS, A STABLE MICROFIBRILLAR STRUCTURE AND GOOD DIMENSIONAL STABILITY, WHICH COMPRISES SPINNING A VISCOSE CONTAINING A CELLULOSE HAVING A DP OF AT LEAST 500 AND A VISCOSITY OF AT LEAST 150 POISES AND A GAMMA INDEX OF AT LEAST 45 WITH A COLD ACID BATH CONTAINING NOT OVER 60 GRAMS OF SULFURIC ACID PER LITER AND FROM 10 TO 120 G./L. SODIUM SULFATE AND SUBSTANTIALLY NO ZINC SULFATE; THE SPINNING TAKING PLACE IN AN UPWARD VERTICAL DIRECTION, AND WHILE THE FILAMENTS ARE STILL INCAPABLE OF SUPPORTING THEMSELVES, CONVEYING SAID FILAMENTS AT THE EXIT OF SAID BATH TANGENTIALLY ON A PARTIALLY IMMERSED HOLLOW ROTATING SURFACE FOR A DISTANCE TO ALLOW PARTIAL EXTRACTION OF THE SAID BATH BY VACUUM THROUGH THE SURFACE AND SIMULTANEOUSLY COAGULATING TO A POINT AT WHICH SAID FILAMENTS BECOME SELF-SUPPORTING AND THEN STRETCHING SAID FILAMENTS IN AIR.
References Cited (Backward Citations)
US2705184A
Cited
US3024493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |