Patent US4193073A successfully refreshed from Google Patents.
Patent US2831748A successfully refreshed from Google Patents.
US2831748A
Expired / Lapsed
US
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Process for melt spinning crimped filaments
Assignee: Acordis UK Ltd
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Filing: 1953-02-25
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Granted: 1958-04-22
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Expires: 1973-02-25
Abstract
No abstract record available.
Inventors
- 👤 Finlayson Donald
- 👤 Harcolinski Antoni
- 👤 Krzesinski Boleslaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/253
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A PROCESS OF MELT-SPINNING WHICH COMPRISES URGING CELLULOSE ACETATE IN POWDERED FORM AGAINST ONE SIDE OF A HEATED PLATE BY INTERMITTENTLY APPLYING MECHANICAL PRSSURE TO THE PARTICLES OF CELLULOSE ACETATE, SAID PLATE BEING PERFORATED BY AN ORIFICE, THE CROSS-SECTIONAL SHAPE OF WHICH COMPRISES AT LEAST ONE NARROW PORTION JOINING TWO WIDER PORTINS, THE WIDTH OF EACH OF SAID WIDER PORTIONS BEING AT LEAST 1.5 TIMES THAT OF SAID NARROW PORTION CONTINUOUSLY APPLYING FURTHER QUANTITIES OF THE CELLULOSE ACETATE TO SAID PLATE, FUSING THE CELLULOSE ACETATE BY MEANS OF HEAT DERIVED FROM SAID PLATE, AND CONTINUOUSLY DRAWING AWAY THE FUSED MATERIAL IN FILAMENT FORM FROM THE ORIFICE AND THROUGH A REGION AT A TEMPERATURE BELOW THE HEAT-SOFTENING POINT OF THE CELLULOSE ACETATE, AT SUCH A RATE AS TO DRAW DOWN SAID FILAMENT, THE TEMPERATURE OF THE PLATE ROUND THE EDGES OF THE APERTURE BEING BETWEEN 290* AND 325*C. AND THE DRAW-DOWN OF THE FILAMENT BEING BETWEEN 1000:1 AND 3000:1
Claim 2
Dependent Claim
158 words
A PROCESS OF MELT-SPINNING WHICH COMPRISES URGING CELLULOSE ACETATE IN POWDERED FORM AGAINST ONE SIDE OF A HEATED PLATE BY INTERMITTENTLY APPLYING MECHANICAL PRSSURE TO THE PARTICLES OF CELLULOSE ACETATE, SAID PLATE BEING PERFORATED BY AN ORIFICE, THE CROSS-SECTIONAL SHAPE OF WHICH COMPRISES AT LEAST ONE NARROW PORTION JOINING TWO WIDER PORTINS, THE WIDTH OF EACH OF SAID WIDER PORTIONS BEING AT LEAST 1.5 TIMES THAT OF SAID NARROW PORTION CONTINUOUSLY APPLYING FURTHER QUANTITIES OF THE CELLULOSE ACETATE TO SAID PLATE, FUSING THE CELLULOSE ACETATE BY MEANS OF HEAT DERIVED FROM SAID PLATE, AND CONTINUOUSLY DRAWING AWAY THE FUSED MATERIAL IN FILAMENT FORM FROM THE ORIFICE AND THROUGH A REGION AT A TEMPERATURE BELOW THE HEAT-SOFTENING POINT OF THE CELLULOSE ACETATE, AT SUCH A RATE AS TO DRAW DOWN SAID FILAMENT, THE TEMPERATURE OF THE PLATE ROUND THE EDGES OF THE APERTURE BEING BETWEEN 290* AND 325*C. AND THE DRAW-DOWN OF THE FILAMENT BEING BETWEEN 1000:1 AND 3000:1
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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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |