US2663704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and composition for producing improved viscose
Assignee: Akzo Nobel UK PLC
•
Filing: 1950-04-19
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Granted: 1953-12-22
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Expires: 1970-04-19
Abstract
No abstract record available.
Inventors
- 👤 Jr George C Yehling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:33
CPC Classifications
C; C08; C08B; C08B9/00; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PRODUCING IMPROVED VISCOSE WHICH COMPRISES FORMING ALKALI CELLULOSE BY STEEPING CELLULOSE IN 15 TO 20% AQUEOUS SODIUM HYDROXIDE CONTAINING FROM ABOUT 0.01 TO 0.1% OF THE SODIUM SALT OF ETHYLENE DIAMINE TETREA ACETIC ACID AND FROM ABOUT 0.001 TO 0.1% OF THE SODIUM SALT OF BETA ETHYL HEXANOL SULFONATE BASED ON THE WEIGHT OF THE STEEPING LIQUOR, AND THEN REACTING THE ALKALI CELLULOSE WITH CS2 TO PRODUCE SODIUM CELLULOSE XANTHATE AND THEN DISSOLVING THE XANTHATE TO PRODUCE VISCOSE.
Claim 2
Dependent Claim
60 words
A COMPOSITION FOR STEEPING CELLULOSE IN THE MANUFACTURE OF ALKALI CELLULOSE COMPRISING A 15 TO 20% AQUEOUS SODIUM HYDROXIDE SOLUTION CONTAINING FROM ABOUT 0.01 TO 0.1% OF THE SODIUM SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID AND FROM ABOUT 0.01 TO 0.01% OF THE ALKALI METAL SALT AF A HIGHER ALIPHATIC ALCHOLOL SULFATE BASE ON THE WEIGHT OF THE STEEPING LIQUOR.
References Cited (Backward Citations)
US2081528A
Cited
GB461747A
Cited
US2114605A
Cited
US2240957A
Cited
US2157294A
Cited
US2502330A
Cited
US2432129A
Cited
US2412943A
Cited
US2412945A
Cited
US2542385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |