US4260739A
Expired / Lapsed
US
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Process and apparatus for preparing a homogeneous solution of xanthated alkali cellulose
Assignee: Fiber Associates Inc
•
Filing: 1979-05-11
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Granted: 1981-04-07
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Expires: 1999-05-11
Abstract
Abstract Process and apparatus for treating xanthated alkali cellulose solution so as to form a homogeneous solution by continuously passing a xanthated alkali cellulose solution through a series of attrition and mixing stages and partially diluting the solution in each stage.
Inventors
- 👤 Charles J. Geyer, Jr
- 👤 Ben E. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:33
CPC Classifications
C; C08; C08B; C08B9/00; C08B9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
In a process for treating a substantially completely xanthated alkali cellulose solution so as to form a homogeneous solution thereof with an alkali hydroxide solution, the improvement which comprises continuously passing a substantially completely xanthated alkali cellulose solution through a series of separate attrition and mixing stages and partially diluting said solution during each mixing stage.
Claim 2
Dependent Claim
56 words
In a process for treating a substantially completely xanthated alkali cellulose solution so as to form a homogeneous solution thereof with an alkali hydroxide solution, the improvement which comprises continuously passing a substantially completely xanthated alkali cellulose solution through a series of separate attrition and mixing stages and partially diluting said solution during each mixing stage.
Claim 3
Dependent Claim
98 words
In an apparatus for treating a xanthated alkali cellulose solution so as to form a homogeneous solution thereof with an alkali hydroxide solution comprising a series of separate and connected attrition mixing chambers, each of said chambers having attrition means through which the xanthated cellulose solution enters into the chamber and mixing means for mixing said xanthated alkali cellulose solution with a diluent, and wherein each mixing chamber is provided with inlet means separated from said attrition means for introducing said diluent into said chamber so as to partially dilute the xanthated alkali cellulose solution in each chamber.
Claim 4
Dependent Claim
98 words
In an apparatus for treating a xanthated alkali cellulose solution so as to form a homogeneous solution thereof with an alkali hydroxide solution comprising a series of separate and connected attrition mixing chambers, each of said chambers having attrition means through which the xanthated cellulose solution enters into the chamber and mixing means for mixing said xanthated alkali cellulose solution with a diluent, and wherein each mixing chamber is provided with inlet means separated from said attrition means for introducing said diluent into said chamber so as to partially dilute the xanthated alkali cellulose solution in each chamber.
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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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |