Patent US3109698A successfully refreshed from Google Patents.
US3109698A
Expired / Lapsed
US
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Method for making high tenacity regenerated cellulose staple fiber
Assignee: Courtaulds North America Inc
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Filing: 1962-04-02
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Granted: 1963-11-05
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Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Klein Elias
- 👤 William C Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:19
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/02; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A METHOD FOR MAKING HIGH TENACITY RAYON FILAMENTS WHEREIN VISCOSE IS EXTRUDED INTO AN AQUEOUS ACID COAGULATING BATH IN THE PRESENCE OF SMALL QUANTITIES OF FORMALDEHYDE TO FORM FILAMENTS, THE FILAMENTS ARE REMOVED FROM SAID COAGULATING BATH WHILE STILL NOT MORE THAN 20% REGENERATED AND ARE THEN STRETCHED IN AN AQUEOUS STRETCH BATH HAVING A TEMPERATURE BETWEEN 60*C. AND ABOUT 95*C., THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE ACID CONCENTRATION OF SAID STRETCH BATH AT LESS THAN 0.5%, AND THE FORMALDEHYDE CONCENTRATION AT LESS THAN 0.2% BY WEIGHT AND MAINTAINING THE FILAMENTS IN SAID SECONDARY BATH UNTIL THEY ARE AT LEAST 90% REGENERATED.
Claim 2
Dependent Claim
103 words
IN A METHOD FOR MAKING HIGH TENACITY RAYON FILAMENTS WHEREIN VISCOSE IS EXTRUDED INTO AN AQUEOUS ACID COAGULATING BATH IN THE PRESENCE OF SMALL QUANTITIES OF FORMALDEHYDE TO FORM FILAMENTS, THE FILAMENTS ARE REMOVED FROM SAID COAGULATING BATH WHILE STILL NOT MORE THAN 20% REGENERATED AND ARE THEN STRETCHED IN AN AQUEOUS STRETCH BATH HAVING A TEMPERATURE BETWEEN 60*C. AND ABOUT 95*C., THE IMPROVEMENT WHICH COMPRISES MAINTAINING THE ACID CONCENTRATION OF SAID STRETCH BATH AT LESS THAN 0.5%, AND THE FORMALDEHYDE CONCENTRATION AT LESS THAN 0.2% BY WEIGHT AND MAINTAINING THE FILAMENTS IN SAID SECONDARY BATH UNTIL THEY ARE AT LEAST 90% REGENERATED.
References Cited (Backward Citations)
US2452130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-04 | 1967-05-06 | 1967-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-04 | 1971-05-06 | 1971-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-04 | 1975-05-06 | 1975-11-05 | $7700.00 | Window Closed / Lapsed |