US2686709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing heavy denier regenerated cellulose filaments
Assignee: EIDP Inc
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Filing: 1952-03-07
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Granted: 1954-08-17
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Expires: 1972-03-07
Abstract
No abstract record available.
Inventors
- 👤 Woodell Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:41
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE PROCESS FOR PRODUCING CRIMPABLE REGENERATED CELLULOSE FILAMENTS AND FIBERS WHEREIN A VISCOSE SOLUTION HAVING AN ALKALI CONTENT OF 4% TO 7.5% AND A SALT INDEX BETWEEN 1.5 AND 7 IS EXTRUDED IN THE FORM OF FILAMENTS INTO A COAGULATING AND REGENERATING BATH HAVING A SULFURIC ACID CONTENT BETWEEN 6.5% AND 9.5%, A SODIUM SULFATE CONTENT BETWEEN 15% AND 30%, A ZJNC SULFATE CONTENT BETWEEN 0.1% AND 3% AND A TEMPERATURE BETWEEN 40* C. AND 75* C., THE RESULTING FILAMENTS ARE CONDUCTED THROUGH THE BATH FOR AT LEAST 50 INCHES, THE FILAMENTS ARE STRETCHED UNDER A TENSION APPROACHING THE BREAKING TENSION AND WHEREIN NOT MORE THAN ONE OF THE ABOVE CRITICAL CONDITIONS IS OUTSIDE OF THE FOLLOWING RANGE FOR THE INDICATED CONDITION:
Claim 2
Dependent Claim
123 words
IN THE PROCESS FOR PRODUCING CRIMPABLE REGENERATED CELLULOSE FILAMENTS AND FIBERS WHEREIN A VISCOSE SOLUTION HAVING AN ALKALI CONTENT OF 4% TO 7.5% AND A SALT INDEX BETWEEN 1.5 AND 7 IS EXTRUDED IN THE FORM OF FILAMENTS INTO A COAGULATING AND REGENERATING BATH HAVING A SULFURIC ACID CONTENT BETWEEN 6.5% AND 9.5%, A SODIUM SULFATE CONTENT BETWEEN 15% AND 30%, A ZJNC SULFATE CONTENT BETWEEN 0.1% AND 3% AND A TEMPERATURE BETWEEN 40* C. AND 75* C., THE RESULTING FILAMENTS ARE CONDUCTED THROUGH THE BATH FOR AT LEAST 50 INCHES, THE FILAMENTS ARE STRETCHED UNDER A TENSION APPROACHING THE BREAKING TENSION AND WHEREIN NOT MORE THAN ONE OF THE ABOVE CRITICAL CONDITIONS IS OUTSIDE OF THE FOLLOWING RANGE FOR THE INDICATED CONDITION:
References Cited (Backward Citations)
US2515834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |