Patent US3924988A successfully refreshed from Google Patents.
US3924988A
Expired / Lapsed
US
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Hollow filament spinneret
Assignee: EIDP Inc
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Filing: 1972-05-24
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Granted: 1975-12-09
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Expires: 1992-05-24
Abstract
Abstract A spinneret provided with a spinning nozzle having a plurality of arcuate segments whose ends bear inner, inwardly tapered enlargements at the outer one-third portions of the segments.
Inventors
- 👤 James Dwight Hodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:01
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
In a spinneret plate provided with at least one nozzle, for melt spinning filaments from molten polymers, said nozzle being defined by a substantially symmetrical pattern of four arcuate end-to-end slots interrupted by webs, said nozzle forming a filament having a single hollow core the improvement comprising, said slots having ends bearing inner inwardly-tapered enlargements at the outer one-third portions thereof, adjacent ends having proximate sides straight and parallel throughout their entire lengths, said slots having outer boundaries, said outer boundaries being the arc of a circle, the inner one-third portion of said slot being of substantially uniform width, the ratio of the distance c between adjacent slots and the width b of the slots being less than unity, said single hollow core being relatively smooth.
Claim 2
Dependent Claim
126 words
In a spinneret plate provided with at least one nozzle, for melt spinning filaments from molten polymers, said nozzle being defined by a substantially symmetrical pattern of four arcuate end-to-end slots interrupted by webs, said nozzle forming a filament having a single hollow core the improvement comprising, said slots having ends bearing inner inwardly-tapered enlargements at the outer one-third portions thereof, adjacent ends having proximate sides straight and parallel throughout their entire lengths, said slots having outer boundaries, said outer boundaries being the arc of a circle, the inner one-third portion of said slot being of substantially uniform width, the ratio of the distance c between adjacent slots and the width b of the slots being less than unity, said single hollow core being relatively smooth.
Claim 3
Dependent Claim
37 words
The spinneret plate as defined in claim 1, the ratio of the area of an outer one-third portion to the area of the inner one-third portion being in the range of from about 1.15 to about 1.40.
Claim 4
Dependent Claim
12 words
The spinneret plate as defined in claim 2, said ratio being 1.16.
Claim 5
Dependent Claim
32 words
The spinneret as defined in claim 1, said enlargements being inwardly tapered at an angle with respect to the end of the slot of less than 80* and more than about 5*.
Claim 6
Dependent Claim
15 words
The spinneret as defined in claim 4, said angle being between 20* to 60* .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |