Patent US4836763A successfully refreshed from Google Patents.
US4836763A
Expired / Lapsed
US
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Seven hole spinneret
Assignee: Invista North America LLC
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Filing: 1988-07-29
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Granted: 1989-06-06
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Expires: 2008-07-29
Abstract
Abstract Segmented spinning capillaries for post-coalescent spinning provide the capability to spin round cross-section filaments with round continuous voids along the length of the filaments by adding an inner arcuate slot at the base of each spoke of each slot segment.
Inventors
- 👤 Clarke R. Broaddus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:22
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/24; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A spinneret for the production of filaments of essentially round cross-section with at least seven continuous voids along the filaments, one void being centrally located, said spinneret comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being defined at said lower surface by a plurality of segments equispaced a distance from and equispaced angularly about the center of the capillary, each of said segments being defined by an inner arcuate slot, connected to an outer arcuate slot by another elongated slot located between and in communication with said inner and said outer arcuate slots.
Claim 2
Dependent Claim
99 words
A spinneret for the production of filaments of essentially round cross-section with at least seven continuous voids along the filaments, one void being centrally located, said spinneret comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being defined at said lower surface by a plurality of segments equispaced a distance from and equispaced angularly about the center of the capillary, each of said segments being defined by an inner arcuate slot, connected to an outer arcuate slot by another elongated slot located between and in communication with said inner and said outer arcuate slots.
Claim 3
Dependent Claim
13 words
The spinneret as defined in claim 1, there being six of said segments.
Claim 4
Dependent Claim
57 words
The spinneret of claim 2 wherein said elongated slot connecting the inner and outer arcuate slots is rectangular in shape and has a width that is greater than the width of the inner arcuate slot and said outer arcuate slot has a width greater than the width of the slot connecting the inner and outer arcuate slots.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |