US3796629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-bonding rayon
Assignee: FMC Corp
•
Filing: 1970-10-15
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Granted: 1974-03-12
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Expires: 1990-10-15
Abstract
Abstract A NON-WOVEN WEB IS PREPARED FROM VISCOSE COMPRISING 1 TO ABOUT 6.5% CELLULOSE, FROM ABOUT 0.6 TO ABOUT %% SODIUM HYDROXIDE BASED ON THE WEIGHT OF VISCOSE, AND FROM ABOUT 27-40% CARBON DISULFIDE BASED ON THE WEIGHT OF CELLULOSE, THE SAID VISCOSE IS EXTRUDED INTO AN AQUEOUS BATH CONTAINING 9 TO 25% SULFURIC ACID, FROM 0 TO ABOUT 0.15% ZINC SULFATE AND FROM ABOUT 0.3 TO ABOUT 23% SODIUM SULFATE TO FORM FILAMENTS. THE SAID FILAMENTS ARE STRETCHED FROM 0 TO 30% OF THEIR SPUN LENGTH, CUT INTO STAPLE FIBERS WHILE IN THE WET GEL STATE AND FORMED INTO A NON-WOVEN WEB.
Inventors
- 👤 Master J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:05
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/02; D21H13/08; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |