US2805119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali cellulose xanthates
Assignee: Viscosuisse SA
•
Filing: 1954-01-12
•
Granted: 1957-09-03
•
Expires: 1974-01-12
Abstract
No abstract record available.
Inventors
- 👤 Studer Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE PRODUCTION OF A SUBSTANTIALLY PURE STABLE ALKALI CELLULOSE XANTHATE HAVING A MOLECULAR RATIO OF AT LEAST 0.45 MOLS OF CSS PER MOL OF GLUCOSE, WHICH COMPRISES EXTRUDING VISCOSE THROUGH A SPINNERET INTO A METHANOL MEDIUM WHICH IS AT A TEMPERATURE BELOW 5*C., TREATING THE ALKALI CELLULOSE XANTHATE FILAMENTS THUS OB-TAINED WITH DIETHYL ETHER AND DRYING THE FILAMENTS FIRST FOR AT LEAST 30 MINUTES AT 30-60*C. AND THEN AT LOW PRESSURE IN THE PRESENCE OF A DEHYDRATING AGENT.
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE PRODUCTION OF A SUBSTANTIALLY PURE STABLE ALKALI CELLULOSE XANTHATE HAVING A MOLECULAR RATIO OF AT LEAST 0.45 MOLS OF CSS PER MOL OF GLUCOSE, WHICH COMPRISES EXTRUDING VISCOSE THROUGH A SPINNERET INTO A METHANOL MEDIUM WHICH IS AT A TEMPERATURE BELOW 5*C., TREATING THE ALKALI CELLULOSE XANTHATE FILAMENTS THUS OB-TAINED WITH DIETHYL ETHER AND DRYING THE FILAMENTS FIRST FOR AT LEAST 30 MINUTES AT 30-60*C. AND THEN AT LOW PRESSURE IN THE PRESENCE OF A DEHYDRATING AGENT.
References Cited (Backward Citations)
US1119155A
Cited
US1467265A
Cited
US1880041A
Cited
US2072738A
Cited
US2054300A
Cited
US2296857A
Cited
US2181920A
Cited
US2647114A
Cited
US2592355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |