US4743189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinneret for a co-spun filament within a hollow filament
Assignee: Invista North America LLC
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Filing: 1986-06-27
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Granted: 1988-05-10
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Expires: 2006-06-27
Abstract
Abstract A hollow fiber which contains within the hollow a co-spun hollow or solid filament. The solid filament is formed of polymer that can distribute energy within the hollow fiber while a co-spun hollow inner filament can also act as a vessel for transportation or separation of fluids. Spinnerets for co-spinning such filaments are of one piece construction.
Inventors
- 👤 Harry V. Samuelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/08; D; D01; D01D; D01D5/00; D01D5/24; D01D5/28; D01D5/30; D01D5/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A one piece spinneret for the production of a hollow filament containing within itself a cospun filament comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a central cavity concentrically located within the inner annular passage, and a second cavity located between said annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and being radially aligned at said angular locations and a bore leading from said lower surface through two aligned bridge members to said cavities.
Claim 2
Dependent Claim
103 words
A one piece spinneret for the production of a hollow filament containing within itself a cospun filament comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a central cavity concentrically located within the inner annular passage, and a second cavity located between said annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and being radially aligned at said angular locations and a bore leading from said lower surface through two aligned bridge members to said cavities.
Claim 3
Dependent Claim
112 words
A one piece spinneret for the production of a hollow filament containing within itself a cospun filament comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a central cavity concentrically located within the inner annular passage, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and being radially aligned at said angular locations and a bore leading from said lower surface through two aligned support members to said central cavity; and a plurality of members bridging the outer annular passage at said lower surface of the spinneret.
Claim 4
Dependent Claim
112 words
A one piece spinneret for the production of a hollow filament containing within itself a cospun filament comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a central cavity concentrically located within the inner annular passage, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and being radially aligned at said angular locations and a bore leading from said lower surface through two aligned support members to said central cavity; and a plurality of members bridging the outer annular passage at said lower surface of the spinneret.
Claim 5
Dependent Claim
72 words
A one piece spinneret for the production of hollow filaments comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and a plurality of members bridging the outer and inner annular passages at said lower surface of the spinneret.
Claim 6
Dependent Claim
72 words
A one piece spinneret for the production of hollow filaments comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and a plurality of members bridging the outer and inner annular passages at said lower surface of the spinneret.
Claim 7
Dependent Claim
93 words
A one piece spinneret for the production of hollow filaments comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a cavity located between said annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and a bore leading from said lower surface through a support member to said annular cavity; and a plurality of members bridging the inner annular passage at said lower surface of the spinneret.
Claim 8
Dependent Claim
93 words
A one piece spinneret for the production of hollow filaments comprising: a plate having upper and lower surfaces connected by a capillary, said capillary being formed of two concentric annular passages, a cavity located between said annular passages, a plurality of supports bridging said annular passages at angular locations around said annular passages, said supports extending through said annular passages and a bore leading from said lower surface through a support member to said annular cavity; and a plurality of members bridging the inner annular passage at said lower surface of the spinneret.
References Cited (Backward Citations)
US1541528A
Cited
US3241503A
Cited
US3856448A
Cited
JPS5388060A
Cited
US4370114A
Cited
JPS5689918A
Cited
JPS59192721A
Cited
US4493629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |