US2558038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellulose xanthate
Assignee: Akzo Nobel UK PLC
•
Filing: 1946-11-23
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Granted: 1951-06-26
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Expires: 1966-11-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John Alfred Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:00
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR PRODUCING CELLULOSE XANTHATE WHICH COMPRISES SUBJECTING A MASS COMPRISING PARTICULATE ALKALI CELLULOSE AND LIQUID CARBON DISULFIDE TO THE INFLUENCE OF HIGH FREQUENCY SOUND WAVE RADIATION HAVING A FREQUENCY OF AT LEAST 1000 CYCLES PER SECOND AT LEAST UNTIL AN INTIMATE PHYSICAL MIXTURE IN WHICH THE CARBON DISULFIDE IS DISTRIBUTED SUBSTANTIALLY UNIFORMLY THROUGHOUT ALL PORTIONS OF THE ALKALI CELLULOSE PARTICLES IS PRODUCED, AND THEN BRINGING THE CHEMICAL REACTION TO COMPLETION TO OBTAIN A SUBSTANTIALLY HOMOGENEOUS CELLULOSE XANTHATE.
Claim 2
Dependent Claim
79 words
A PROCESS FOR PRODUCING CELLULOSE XANTHATE WHICH COMPRISES SUBJECTING A MASS COMPRISING PARTICULATE ALKALI CELLULOSE AND LIQUID CARBON DISULFIDE TO THE INFLUENCE OF HIGH FREQUENCY SOUND WAVE RADIATION HAVING A FREQUENCY OF AT LEAST 1000 CYCLES PER SECOND AT LEAST UNTIL AN INTIMATE PHYSICAL MIXTURE IN WHICH THE CARBON DISULFIDE IS DISTRIBUTED SUBSTANTIALLY UNIFORMLY THROUGHOUT ALL PORTIONS OF THE ALKALI CELLULOSE PARTICLES IS PRODUCED, AND THEN BRINGING THE CHEMICAL REACTION TO COMPLETION TO OBTAIN A SUBSTANTIALLY HOMOGENEOUS CELLULOSE XANTHATE.
References Cited (Backward Citations)
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Cited
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GB468993A
Cited
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Cited
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Cited
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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 |