US3729279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinnerette with head filter
Assignee: Mott Corp
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Filing: 1971-06-24
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Granted: 1973-04-24
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Expires: 1991-06-24
Abstract
Abstract The central cavity of a spinnerette head assembly for the extrusion of synthetic polymer fibers is substantially filled by a filter element having a filter disk and upstanding concentric rings extending upward from the disk within the central cavity, the filter area presented to inflowing plastic being at least twice the cross-sectional area of the cavity and the concentric rings occupying at least 45 per cent of the volume of the cavity, the filter element containing concentric circles of closely spaced upward outflow bores extending through the filter disk to the upper portions of the concentric rings.
Inventors
- 👤 L Mott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:17
CPC Classifications
D; D01; D01D; D01D4/00; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/69; D01D1/00; D01D1/10; D01D1/106; B29C48/03; B29C48/05; B29C48/254; B29C48/2545
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A filter element for use in a spinnerette head for the extrusion of synthetic polymer fibers, said spinnerette head having a holder with means securing and sealing said filter element therein, said holder containing a large central cavity in front of said filter element, a pipe introducinG plastic at extrusion pressures into the large central cavity of said holder, and a spinnerette disk containing extrusion apertures fixed to said holder below said filter element, said filter element comprising, in combination, a filter disk secured and sealed within said holder by said means, and a plurality of upstanding, concentric rings extending from said filter disk, said disk and said rings being integrally formed of porous material, said rings occupying at least 45 per cent of the volume of the central cavity of said holder, said filter element presenting an area at least twice the cross-sectional area of said central cavity to inflowing synthetic polymer material, said filter element containing upward extending circles of closely spaced outflow bores, said bores extending through said disk to the upper portions of said concentric, upstanding rings.
Claim 2
Dependent Claim
181 words
A filter element for use in a spinnerette head for the extrusion of synthetic polymer fibers, said spinnerette head having a holder with means securing and sealing said filter element therein, said holder containing a large central cavity in front of said filter element, a pipe introducinG plastic at extrusion pressures into the large central cavity of said holder, and a spinnerette disk containing extrusion apertures fixed to said holder below said filter element, said filter element comprising, in combination, a filter disk secured and sealed within said holder by said means, and a plurality of upstanding, concentric rings extending from said filter disk, said disk and said rings being integrally formed of porous material, said rings occupying at least 45 per cent of the volume of the central cavity of said holder, said filter element presenting an area at least twice the cross-sectional area of said central cavity to inflowing synthetic polymer material, said filter element containing upward extending circles of closely spaced outflow bores, said bores extending through said disk to the upper portions of said concentric, upstanding rings.
Claim 3
Dependent Claim
52 words
The combination according to claim 1 with the addition of a central element of porous material extending upward from the center of said disk, said concentric rings extending about said central element, said central element containing an outflow bore therein extending through said disk to the upper portion of said central element.
Claim 4
Dependent Claim
45 words
The combination according to claim 1 with the addition of scallops formed in the inner and outer surfaces of said rings about each bore therein, said scallops providing flow paths of substantially the same length from the surfaces of said rings to the bores therein.
Claim 5
Dependent Claim
68 words
The combination according to claim 3 with the addition of a central element of porous material extending upward from the center of said disk, said concentric rings being disposed about said central element, said central element containing an outflow bore extending through said disk to the upper portion of said central element, said central element having an outer surface with the same radius of curvature as said scallops.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |