US3861843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming laminar crimpable filaments
Assignee: Celanese Corp
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Filing: 1973-07-17
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Granted: 1975-01-21
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Expires: 1993-07-17
Abstract
Abstract Apparatus for producing a crimpable filament from a homogeneous polymer composition supply comprising means to divide the polymer supply into separate flow paths, means to subject each flow path to different environments and means to recombine the flow paths and extrude a two-component filament.
Inventors
- 👤 Herbert W Keuchel
- 👤 Walter J Polestak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:48
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/32; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/345; D01D5/22; B29C48/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
An apparatus for forming a crimpable filament from a single polymer composition comprising, means for receiving a flow of said polymer composition in a molten state, at least two chamber means for receiving separate portions of said flow, each of said chamber means containing a porous element having differing shear resistances, means for subjecting said separate portions to a predetermined different thermal environment in said chamber means, means for combining said portions of said flow upon exit from said chambers and means for jointly extruding said combined portions to form laminar crimpable filaments from said combined polymer portions.
Claim 2
Independent Claim
98 words
An apparatus for forming a crimpable filament from a single polymer composition comprising, means for receiving a flow of said polymer composition in a molten state, at least two chamber means for receiving separate portions of said flow, each of said chamber means containing a porous element having differing shear resistances, means for subjecting said separate portions to a predetermined different thermal environment in said chamber means, means for combining said portions of said flow upon exit from said chambers and means for jointly extruding said combined portions to form laminar crimpable filaments from said combined polymer portions.
References Cited (Backward Citations)
US3408277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |