Patent US2647114A successfully refreshed from Google Patents.
US2647114A
Expired / Lapsed
US
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Method for making readily filterable viscose
Assignee: Phrix Werke AG
•
Filing: 1950-12-02
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Granted: 1953-07-28
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Expires: 1970-12-02
Abstract
No abstract record available.
Inventors
- 👤 Torke Erich
- 👤 Matthaes Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:53
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/04; D06N3/06; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D06N3/0056; D06N3/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE METHOD FOR MAKING READILY FILTERABLE VISCOSE BY THE SULFIDING AT A TEMPERATURE OF 20* TO 40* C. WITH CARBON DISULFIDE OF AN ALKALI CELLULOSE PRODUCED BY THE IMPREGNATION OF CELLULOSE WITH A 16-26% CAUSTIC SOLUTION, AND HAVING A DEGREE OF POLYMERIZATION CORRESPONDING TO AN ALKALI CELLULOSE PRODUCED FROM CELLULOSE WITH A POLYMERIZATION DEGREE OF ABOUT 250 TO J00, AND THE ADDITION OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LYE AND WATER TO THE RESULTING XANTHAGENATE FOR THE FORMATION OF VISCOSE, THE IMPROVEMENT WHICH COMPRISES ADDING AT LEAST ONE FIFTH OF SAID SOLVENT AFTER THE COMPLETION OF THE CARBON DISULFIDE ADDITION FOR SAID SULFIDING AND EFFECTING SAID SULFIDING IN THE PRESENCE OF SAID SOLVENT.
Claim 2
Dependent Claim
117 words
IN THE METHOD FOR MAKING READILY FILTERABLE VISCOSE BY THE SULFIDING AT A TEMPERATURE OF 20* TO 40* C. WITH CARBON DISULFIDE OF AN ALKALI CELLULOSE PRODUCED BY THE IMPREGNATION OF CELLULOSE WITH A 16-26% CAUSTIC SOLUTION, AND HAVING A DEGREE OF POLYMERIZATION CORRESPONDING TO AN ALKALI CELLULOSE PRODUCED FROM CELLULOSE WITH A POLYMERIZATION DEGREE OF ABOUT 250 TO J00, AND THE ADDITION OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF LYE AND WATER TO THE RESULTING XANTHAGENATE FOR THE FORMATION OF VISCOSE, THE IMPROVEMENT WHICH COMPRISES ADDING AT LEAST ONE FIFTH OF SAID SOLVENT AFTER THE COMPLETION OF THE CARBON DISULFIDE ADDITION FOR SAID SULFIDING AND EFFECTING SAID SULFIDING IN THE PRESENCE OF SAID SOLVENT.
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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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |