US2648661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing viscose
Assignee: Akzo Nobel UK PLC
•
Filing: 1950-02-03
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Granted: 1953-08-11
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Expires: 1970-02-03
Abstract
No abstract record available.
Inventors
- 👤 Charles D Vandenburgh
- 👤 Maurice P Kulp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:07
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
IN A PROCESS FOR PRODUCING VISCOSE THE STEPS COMPRISING STEEPING AND SHREEDING CELLULOSE IN AN AQUEOUS ALKALINE SOLUTION, PRESSING THE STEEPED CELLULOSE TO FORM A CAKE THEREOF HAVING A PREDETERMINED RATIO OF ALKALI CELLULOSE TO ORIGINAL DRY CELLULOSE, AGEING THE ALKALI CELLULOSE CAKE BY PASSING IT THROUGH A PATH IN INTERMITTENT STEPS, DISINTEGRATING THE CAKE, MIXING THE DISINTEGRATED CAKE WITH CARBON DISULFIDE, REACTING THE DISINTEGRATED CAKE WITH CARBON DISULFIDE TO FORM CELLULOSE XANTHATE THEREFROM, MIXING THE CELLULOSE XANTHATE WITH AN AQUEOUS ALKALINE SOLUTION TO FORM A XATHATE SLURRY, AND HOMOGENIZING SAID SLURRY.
Claim 2
Dependent Claim
92 words
IN A PROCESS FOR PRODUCING VISCOSE THE STEPS COMPRISING STEEPING AND SHREEDING CELLULOSE IN AN AQUEOUS ALKALINE SOLUTION, PRESSING THE STEEPED CELLULOSE TO FORM A CAKE THEREOF HAVING A PREDETERMINED RATIO OF ALKALI CELLULOSE TO ORIGINAL DRY CELLULOSE, AGEING THE ALKALI CELLULOSE CAKE BY PASSING IT THROUGH A PATH IN INTERMITTENT STEPS, DISINTEGRATING THE CAKE, MIXING THE DISINTEGRATED CAKE WITH CARBON DISULFIDE, REACTING THE DISINTEGRATED CAKE WITH CARBON DISULFIDE TO FORM CELLULOSE XANTHATE THEREFROM, MIXING THE CELLULOSE XANTHATE WITH AN AQUEOUS ALKALINE SOLUTION TO FORM A XATHATE SLURRY, AND HOMOGENIZING SAID SLURRY.
Claim 3
Independent Claim
87 words
AN APPARATUS FOR PRODUCING VISCOSE COMPRISING IN COMBINATION CELLULOSE STEEPING MEANS, SHREDDING MEANS IN THE STEEPING MEANS, HYDRAULIC MEANS BELOW THE STEEPING MEANS FOR PRESSING A SLURRY TO FORM A CAKE, VERTICALLY MOVABLE CONDUIT MEANS CONNECTING THE STEEPING AND PRESSING MEANS, ENDLESS BELT MEANS ADJACENT THE PRESSING MEANS FOR REMOVING THE PRESSED CAKES THEREFROM, MEANS ABOVE THE PRESSING MEANS TO TRANSGER THE CAKES FROM THE PRESSING MEANS TO THE BELT MEANS AND MEANS FOR CONTROLLING THE OPERATION OF AFOREMENTIONED MEANS SEQUENTIALLY AND PERIODICALLY AT PREDETERMINED TIME INTERVALS.
Claim 4
Independent Claim
87 words
AN APPARATUS FOR PRODUCING VISCOSE COMPRISING IN COMBINATION CELLULOSE STEEPING MEANS, SHREDDING MEANS IN THE STEEPING MEANS, HYDRAULIC MEANS BELOW THE STEEPING MEANS FOR PRESSING A SLURRY TO FORM A CAKE, VERTICALLY MOVABLE CONDUIT MEANS CONNECTING THE STEEPING AND PRESSING MEANS, ENDLESS BELT MEANS ADJACENT THE PRESSING MEANS FOR REMOVING THE PRESSED CAKES THEREFROM, MEANS ABOVE THE PRESSING MEANS TO TRANSGER THE CAKES FROM THE PRESSING MEANS TO THE BELT MEANS AND MEANS FOR CONTROLLING THE OPERATION OF AFOREMENTIONED MEANS SEQUENTIALLY AND PERIODICALLY AT PREDETERMINED TIME INTERVALS.
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |