US2651581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a cuprammonium cellulose solution
Assignee: Cellulose Fibers Inc
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Filing: 1952-07-30
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Granted: 1953-09-08
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Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 Edward J Courtney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:13
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD FOR PREPARING A CELLULOSE SOLUTION WHICH COMPRISES PROVIDING IN A CONTAINER HAVING AN AGITATING MEMBER CARRIED BY A SUBSTANTIALLY VERTICAL SHAFT LATERALLY OF THE CENTER OF THE CONTAINER, A MIXTURE OF ALPHA CELLULOSE, A CAUSTICIZING AGENT THEREFOR, A SOLUBLE COPPER COMPOUND, WATER AND AMMONIA TO FORM A COPPER AMMONIUM COMPLEX, VIOLENTLY AGITATING THE MIXTURE BY ROTATING THE MEMBER WHILE ROTATING THE CONTAINER IN A DIRECTION OPPOSITE TO THAT OF THE AGITATING MEMBER TO PROVIDE A ZONE OF AGITATTION, WHEREBY ALL PARTS OF THE MIXTURE ARE RAPIDLY AND REPEATEDLY BROUGHT INTO AND OUT OF THE ZONE OF AGITATION AND THE INGREDIENTS ARE FORMED INTO A SUBSTANTIALLY FIBER-FREE SOLUTION.
Claim 2
Independent Claim
109 words
A METHOD FOR PREPARING A CELLULOSE SOLUTION WHICH COMPRISES PROVIDING IN A CONTAINER HAVING AN AGITATING MEMBER CARRIED BY A SUBSTANTIALLY VERTICAL SHAFT LATERALLY OF THE CENTER OF THE CONTAINER, A MIXTURE OF ALPHA CELLULOSE, A CAUSTICIZING AGENT THEREFOR, A SOLUBLE COPPER COMPOUND, WATER AND AMMONIA TO FORM A COPPER AMMONIUM COMPLEX, VIOLENTLY AGITATING THE MIXTURE BY ROTATING THE MEMBER WHILE ROTATING THE CONTAINER IN A DIRECTION OPPOSITE TO THAT OF THE AGITATING MEMBER TO PROVIDE A ZONE OF AGITATTION, WHEREBY ALL PARTS OF THE MIXTURE ARE RAPIDLY AND REPEATEDLY BROUGHT INTO AND OUT OF THE ZONE OF AGITATION AND THE INGREDIENTS ARE FORMED INTO A SUBSTANTIALLY FIBER-FREE SOLUTION.
References Cited (Backward Citations)
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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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |