US4276011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinnerette assembly
Assignee: Wyeth Holdings LLC
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Filing: 1979-02-21
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Granted: 1981-06-30
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Expires: 1999-02-21
Abstract
Abstract A spinerette assembly wherein tapered passageways and distribution chambers of diminishing length are so arranged as to provide equal back pressure over all orifices thereby providing extrudates of improved uniformity of diameter after stretching.
Inventors
- 👤 Edwin J. Siegman
- 👤 Roy L. Yelverton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
D; D01; D01D; D01D4/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
A circular spinnerette assembly for extruding hardenable fluid material at substantially equal back-pressure which comprises in combination a. a circular body member containing at the top in the central area thereof a conduit, at the bottom a spinnerette plate containing a plurality of orifices with counterbores, said orifices being arranged in concentric circular rows about the center of said circular body with the number of orifices in each row decreasing as the rows approach the center, and located within said circular body from top to bottom in the order named b. a first tapered passageway at the exit of said conduit decreasing in volume from the center to the outer periphery of said body, c. collector means at the exit of said first passageway and at the outer periphery of said body. d. a second tapered passageway at the exit of said collector means which tapers towards the center of said body and communicates with e. a plurality of distribution chambers having lengths which decrease as their position within said body approaches the center of said body and which chambers communicate with the plurality of counterbores and orifices of said spinnerette plate.
Claim 2
Dependent Claim
192 words
A circular spinnerette assembly for extruding hardenable fluid material at substantially equal back-pressure which comprises in combination a. a circular body member containing at the top in the central area thereof a conduit, at the bottom a spinnerette plate containing a plurality of orifices with counterbores, said orifices being arranged in concentric circular rows about the center of said circular body with the number of orifices in each row decreasing as the rows approach the center, and located within said circular body from top to bottom in the order named b. a first tapered passageway at the exit of said conduit decreasing in volume from the center to the outer periphery of said body, c. collector means at the exit of said first passageway and at the outer periphery of said body. d. a second tapered passageway at the exit of said collector means which tapers towards the center of said body and communicates with e. a plurality of distribution chambers having lengths which decrease as their position within said body approaches the center of said body and which chambers communicate with the plurality of counterbores and orifices of said spinnerette plate.
Claim 3
Dependent Claim
13 words
The spinnerette assembly of claim 1 wherein filter means interrupt the distribution chambers.
Claim 4
Dependent Claim
9 words
The spinnerette assembly of claim 1 in annular form.
Claim 5
Dependent Claim
13 words
The spinnerette assembly of claim 3 wherein filter means interrupt the distribution chambers.
Claim 6
Dependent Claim
19 words
The spinnerette assembly of claim 3 wherein conducting means for heat transfer medium is provided in the annular area.
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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |