Patent US3709971A successfully refreshed from Google Patents.
US3709971A
Expired / Lapsed
US
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Method and apparatus for producing multi-laminated fibers
Assignee: EXLAN CO Ltd
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Filing: 1970-05-13
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Granted: 1973-01-09
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Expires: 1990-05-13
Abstract
Abstract This invention relates to a process and apparatus for producing new multi-laminated fibers in which at least two different kinds of fiber-forming components are mutually dispersed in the crosssection of the fiber.
Inventors
- 👤 K Shimoda
- 👤 M Ueki
- 👤 N Tsutsui
- 👤 K Zoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:45
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A process as claimed in claim 1 wherein H is equal to or greater than about 300 microns.
Claim 2
Dependent Claim
34 words
A process as claimed in claim 1 wherein one of the fiber-forming components is an acrylonitrile copolymer dyeable with an acidic dye while the other is an acrylonitrile copolymer dyeable with a basic dye.
Claim 3
Independent Claim
155 words
An apparatus for producing multi-laminated fibers comprising independent flow passages through which at least two different kinds of acrylic polymers and copolymers are made to flow down in the form of laminar flows alternately arranged and isolated from each other, a dispersing region filled with a dispersion aid, provided below the said independent flow passages, and a spinnerette provided below the dispersion region, said apparatus having dimensional characteristics defined by the formula PDT 1 < or = H < or = 125PDT 1 wherein P is the center distance in mm. between adjacent independent flow passages through which different kinds of fiber-forming components are made to flow down in the form of laminar flows, D is the typical dimension in mm. of the dispersion aid, T is the thickness in mm. along the fiber spinning direction of the dispersion region and H is the center distance in mm. between adjacent spinning orifices in the spinnerette.
Claim 4
Dependent Claim
18 words
An apparatus as claimed in claim 4 wherein H is equal to, or greater than about 300 microns.
Claim 5
Dependent Claim
20 words
An apparatus as claimed in claim 4 wherein the dispersion aid is fine grains or particles of a stainless steel.
Claim 6
Dependent Claim
14 words
An apparatus as claimed in claim 4 wherein the dispersion aid is MacMahon packing.
Claim 7
Dependent Claim
14 words
An apparatus as claimed in claim 4 wherein the dispersion aid is DIckson packing.
References Cited (Backward Citations)
GB760179A
Cited
US3006028A
Cited
US3038240A
Cited
US3182106A
Cited
US3546328A
Cited
GB1058448A
Cited
US3344472A
Cited
US3469279A
Cited
US3447308A
Cited
JPS4319604Y1
Cited
JPS43524Y1
Cited
US3531368A
Cited
JPS44890Y1
Cited
JPS443505Y1
Cited
NL6803669A
Cited
US3577308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |