Patent US4578191A successfully refreshed from Google Patents.
US2552598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of cellulose ester textile materials
Assignee: Celanese Corp
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Filing: 1949-08-09
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Granted: 1951-05-15
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Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Sowter Percy Frederick Combe
- 👤 Hill Frank Brentnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:52
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/24; D01F2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE PROCESS FOR THE MANUFACTURE OF YARNS HAVING A BASIS OF A LOWER ALIPHATIC ESTER OF CELLULOSE AND SUITABLE FOR CONVERSION INTO STAPLE FIBRE, WHICH COMPRISES FORMING FILAMENTS FROM THE CELLULOSE ESTER BY EXTRUDING THROUGH A MULTI-HOLE SPINNING JET AN ACETONE SOLUTION OF THE CELLULOSE ESTER INTO AN AQUEOUS SOLUTION OF DIETHYLENE GLYCOL DIACETATE OF CONCENTRATION BELOW 38% AS COAGULATING BATH, STRETCHING THE FILAMENTS DURING THEIR PASSAGE THROUGH THE COAGULATING BATH, AND THEN SUBJECTING THE FILAMENTS, UNTIL THEY ARE SUB-
Claim 2
Dependent Claim
80 words
THE PROCESS FOR THE MANUFACTURE OF YARNS HAVING A BASIS OF A LOWER ALIPHATIC ESTER OF CELLULOSE AND SUITABLE FOR CONVERSION INTO STAPLE FIBRE, WHICH COMPRISES FORMING FILAMENTS FROM THE CELLULOSE ESTER BY EXTRUDING THROUGH A MULTI-HOLE SPINNING JET AN ACETONE SOLUTION OF THE CELLULOSE ESTER INTO AN AQUEOUS SOLUTION OF DIETHYLENE GLYCOL DIACETATE OF CONCENTRATION BELOW 38% AS COAGULATING BATH, STRETCHING THE FILAMENTS DURING THEIR PASSAGE THROUGH THE COAGULATING BATH, AND THEN SUBJECTING THE FILAMENTS, UNTIL THEY ARE SUB-
References Cited (Backward Citations)
US2075027A
Cited
US2070630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |