Patent US3018158A successfully refreshed from Google Patents.
US3018158A
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Viscose process
Assignee: Rayonier Inc
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Filing: 1959-05-05
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Granted: 1962-01-23
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Expires: 1979-05-05
Abstract
No abstract record available.
Inventors
- 👤 Mitchell Reid Logan
- 👤 Berry James Wesley
- 👤 Wadman William Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:15
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
110 words
IN THE VISCOSE PROCESS THE IMPROVEMENT WHICH COMPRISES FORMING A VISCOSE SPINNING SOLUTION CONTAINING FROM 4% OF 13% OF CELLULOSE OF RELATIVELY UNIFORM CHAIN LENGTH AT A DEGREE OF POLYMERIZATION LEVEL OF FROM 300 TO 800 AND SODIUM HYDROXIDE VARYING FROM 5% TO 13% AND HAVING A SALT INDEX OF FROM 4 TO 20, INCORPORATING IN THE VISCOSE FROM 0.05% TO 1% BASED ON THE VISCOSE OF FORMALDEHYDE AS A REGENERATION RETARDANT, SPINNING THE VISCOSE INTO AN ACID COAGULATING-REGNERATING SPIN-BATH CONTAINING SULFURIC ACID IN WHICH THE RETARDATION OF REGENERATION IS EFFECTED ESSENTIALLY BY THE FORMALDEHYDE AND STRETCHING THE RESULTING FILAMENTS DURING REGERNATION AT LEAST 70% PRODUCING HIGH STRENGTH THICK-SKIN FILAMENTS.
Claim 2
Dependent Claim
110 words
IN THE VISCOSE PROCESS THE IMPROVEMENT WHICH COMPRISES FORMING A VISCOSE SPINNING SOLUTION CONTAINING FROM 4% OF 13% OF CELLULOSE OF RELATIVELY UNIFORM CHAIN LENGTH AT A DEGREE OF POLYMERIZATION LEVEL OF FROM 300 TO 800 AND SODIUM HYDROXIDE VARYING FROM 5% TO 13% AND HAVING A SALT INDEX OF FROM 4 TO 20, INCORPORATING IN THE VISCOSE FROM 0.05% TO 1% BASED ON THE VISCOSE OF FORMALDEHYDE AS A REGENERATION RETARDANT, SPINNING THE VISCOSE INTO AN ACID COAGULATING-REGNERATING SPIN-BATH CONTAINING SULFURIC ACID IN WHICH THE RETARDATION OF REGENERATION IS EFFECTED ESSENTIALLY BY THE FORMALDEHYDE AND STRETCHING THE RESULTING FILAMENTS DURING REGERNATION AT LEAST 70% PRODUCING HIGH STRENGTH THICK-SKIN FILAMENTS.
References Cited (Backward Citations)
US2452130A
Cited
US2479218A
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US2535045A
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US2535044A
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US2781275A
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US2937070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |