Patent US2558037A successfully refreshed from Google Patents.
US2558037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscose production
Assignee: Akzo Nobel UK PLC
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Filing: 1946-08-21
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Granted: 1951-06-26
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Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Jr John Alfred Calhoun
- 👤 Frederick C Wedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE PRODUCTION OF VISCOSE, THE METHOD OF AGEING THE VISCOSE TO THE VISCOSITY AT WHICH IT IS TO BE FORMED INTO SHAPED ARTICLES WHICH COMPRISES SUBJECTING A MASS COMPRISING AT LEAST SOME UNDISSOLVED CELLULOSE XANTHATE AND AQUEOUS SODIUM HYDROXIDE TO HIGH FREQUENCY SOUND WAVES HAVING A FREQUENCY OF AT LEAST 1000 CYCLES PER SECOND UNTIL A SMOOTH, SUBSTANTIALLY HOMOGENEOUS VISCOSE HAVING A VISCOSITY APPROXIMATING THE MINIMUM LOW POINT WHICH THE VISCOSITY OF VISCOSE REACHES DURING NORMAL STORAGE THEREOF FOR AGEING AND BEFORE IT AGAIN TENDS TO RISE, AND THEN STORING THE VISCOSE WITHOUT SUBJECTING IT TO AGITATION UNTIL THE VISCOSITY HAS RISEN TO THAT VISCOSITY AT WHICH THE VISCOSE IS TO BE FORMED INTO SHAPED ARTICLES.
Claim 2
Dependent Claim
117 words
IN THE PRODUCTION OF VISCOSE, THE METHOD OF AGEING THE VISCOSE TO THE VISCOSITY AT WHICH IT IS TO BE FORMED INTO SHAPED ARTICLES WHICH COMPRISES SUBJECTING A MASS COMPRISING AT LEAST SOME UNDISSOLVED CELLULOSE XANTHATE AND AQUEOUS SODIUM HYDROXIDE TO HIGH FREQUENCY SOUND WAVES HAVING A FREQUENCY OF AT LEAST 1000 CYCLES PER SECOND UNTIL A SMOOTH, SUBSTANTIALLY HOMOGENEOUS VISCOSE HAVING A VISCOSITY APPROXIMATING THE MINIMUM LOW POINT WHICH THE VISCOSITY OF VISCOSE REACHES DURING NORMAL STORAGE THEREOF FOR AGEING AND BEFORE IT AGAIN TENDS TO RISE, AND THEN STORING THE VISCOSE WITHOUT SUBJECTING IT TO AGITATION UNTIL THE VISCOSITY HAS RISEN TO THAT VISCOSITY AT WHICH THE VISCOSE IS TO BE FORMED INTO SHAPED ARTICLES.
References Cited (Backward Citations)
GB332533A
Cited
CA423382A
Cited
US1738565A
Cited
US2138051A
Cited
US2296378A
Cited
US2306107A
Cited
GB604864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |