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US3109700A
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Method for making rayon filaments
Assignee: Courtaulds North America Inc
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Filing: 1962-05-04
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Granted: 1963-11-05
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Klein Elias
- 👤 Donald S Nelson
- 👤 Basil E M Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:34
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A METHOD FOR THE MANUFACTURE OF RAYON FILAMENTS WHEREIN VISCOSE IS EXTRUDED INTO AN ACID SPINNING BATH TO FORM FILAMENTS AND SAID FILAMENTS ARE STRETCHED, THE IMPROVEMENT WHICH COMPRISES MIXING AN AQUEOUS SOLUTION CONTAINING BETWEEN ABOUT 1 AND ABOUT 20% FORMALDEHYDE WITH SAID VISCOSE NOT MORE THAN TWO HOURS PRIOR TO SPINNING, SAID FORMALDEHYDE BEING IN SUBSTANTIALLY MONOMERIC FORM WHEN ADDED TO SAID VISCOSE.
Claim 2
Dependent Claim
65 words
IN A METHOD FOR THE MANUFACTURE OF RAYON FILAMENTS WHEREIN VISCOSE IS EXTRUDED INTO AN ACID SPINNING BATH TO FORM FILAMENTS AND SAID FILAMENTS ARE STRETCHED, THE IMPROVEMENT WHICH COMPRISES MIXING AN AQUEOUS SOLUTION CONTAINING BETWEEN ABOUT 1 AND ABOUT 20% FORMALDEHYDE WITH SAID VISCOSE NOT MORE THAN TWO HOURS PRIOR TO SPINNING, SAID FORMALDEHYDE BEING IN SUBSTANTIALLY MONOMERIC FORM WHEN ADDED TO SAID VISCOSE.
References Cited (Backward Citations)
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 |