US3352957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning cellulosic fibers
Assignee: Chimiotex SA
•
Filing: 1963-11-04
•
Granted: 1967-11-14
•
Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Herrbach Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:36
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01F11/00; D01F11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE PRODUCTION OF FILAMENTS OF REGENERATED CELLULOSE HAVING A WET TENACITY OF AT LEAST 4G./D. AND AN ELONGATION IN THE WET STATE OF LESS THAN 3% UNDER A LOAD OF 0.5 G./D. WHICH COMPRISES SPINNING A VISCOSE HAVING A VISCOSITY OF AT LEAST 400 POISES, A GAMMA INDEX OF AT LEAST 45 AND CONTAINING A CELLULOSE HAVING A DP OF AT LEAST 500 INTO A SPINNING BATH CONTAINING LESS THAN 40 G./L. OF SULPHURIC ACID, FROM 10 TO 100 G/L. OF SODIUM SULPHATE AND LESS THAN 1 G./L. OF ZINC SULPHATE, WHILE MAINTAINING THE BATH AT A TEMPERATURE BELOW 10*C., WITHDRAWING THE FILAMENTS FROM THE SPINNING BATH, REMOVING THE EXCESS SOLUTION FROM SAID FILAMENTS BY PRESSURE, THEN PASSING THE POSITION AS SAID SPINNING BATH, AND THEN THROUGH A THIRD BATH CONTAINING HOT DILUTE ACID, WHILE STRETCHING THE FILA-
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE PRODUCTION OF FILAMENTS OF REGENERATED CELLULOSE HAVING A WET TENACITY OF AT LEAST 4G./D. AND AN ELONGATION IN THE WET STATE OF LESS THAN 3% UNDER A LOAD OF 0.5 G./D. WHICH COMPRISES SPINNING A VISCOSE HAVING A VISCOSITY OF AT LEAST 400 POISES, A GAMMA INDEX OF AT LEAST 45 AND CONTAINING A CELLULOSE HAVING A DP OF AT LEAST 500 INTO A SPINNING BATH CONTAINING LESS THAN 40 G./L. OF SULPHURIC ACID, FROM 10 TO 100 G/L. OF SODIUM SULPHATE AND LESS THAN 1 G./L. OF ZINC SULPHATE, WHILE MAINTAINING THE BATH AT A TEMPERATURE BELOW 10*C., WITHDRAWING THE FILAMENTS FROM THE SPINNING BATH, REMOVING THE EXCESS SOLUTION FROM SAID FILAMENTS BY PRESSURE, THEN PASSING THE POSITION AS SAID SPINNING BATH, AND THEN THROUGH A THIRD BATH CONTAINING HOT DILUTE ACID, WHILE STRETCHING THE FILA-
References Cited (Backward Citations)
US2607955A
Cited
US2705184A
Cited
US2703270A
Cited
GB915803A
Cited
US3108849A
Cited
US3153687A
Cited
US3226461A
Cited
US3109700A
Cited
US3083075A
Cited
US3139467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |