Patent US4717331A successfully refreshed from Google Patents.
US4717331A
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US
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Spinning nozzle
Assignee: Eneos Corp
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Filing: 1985-05-30
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Granted: 1988-01-05
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Expires: 2005-05-30
Abstract
Abstract A melt-spinning nozzle in which is disposed an elongated molded piece so as to form a space serving as a melt flow path between the elongated molded piece and the inner wall of the nozzle.
Inventors
- 👤 Naoyuki Maeda
- 👤 Osamu Kato
- 👤 Hirosaku Oshimi
- 👤 Akira Nii
- 👤 Hiroshi Shimada
- 👤 Michiharu Harakawa
- 👤 Takuji Hirano
- 👤 Shigeo Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:58
CPC Classifications
D; D01; D01F; D01F9/00; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; D01D; D01D4/00; D01D4/02; B29C48/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A nozzle for controlling the cross-sectional structure of a pitch fiber produced by melt-spinning a mesophase pitch, said nozzle comprising: a capillary defining an elongated capillary channel extending along a predetermined axis for forming said pitch fiber; a counterbore orifice of greater cross sectional dimension than that of said capillary channel aligned therewith, said orifice defining a cavity having an inner surface; and an elongated molded piece dimensioned so as not to contact said capillary and so as to be centrally received within said cavity with a predetermined spacing between said molded piece and said inner surface, said spacing defining an annular pitch flow path communicating with said capillary channel, said molded piece having a contoured outer surface including a groove or projection thereon, said groove or projection disposed within said counterbore orifice operative to orient the molecular structure of said pitch as it flows thereover to produce a fiber having a random on onion-skin cross-sectional structure.
Claim 2
Dependent Claim
157 words
A nozzle for controlling the cross-sectional structure of a pitch fiber produced by melt-spinning a mesophase pitch, said nozzle comprising: a capillary defining an elongated capillary channel extending along a predetermined axis for forming said pitch fiber; a counterbore orifice of greater cross sectional dimension than that of said capillary channel aligned therewith, said orifice defining a cavity having an inner surface; and an elongated molded piece dimensioned so as not to contact said capillary and so as to be centrally received within said cavity with a predetermined spacing between said molded piece and said inner surface, said spacing defining an annular pitch flow path communicating with said capillary channel, said molded piece having a contoured outer surface including a groove or projection thereon, said groove or projection disposed within said counterbore orifice operative to orient the molecular structure of said pitch as it flows thereover to produce a fiber having a random on onion-skin cross-sectional structure.
Claim 3
Dependent Claim
38 words
A nozzle as defined in claim 1 wherein said nozzle is disposed within a die plate of predetermined thickness, and said piece extends within said die plate a length equal to at least one third of said thickness.
Claim 4
Dependent Claim
33 words
A nozzle as defined in claim 1 wherein said space between said inner surface and said molded piece has a cross-sectional area at least equal to the cross-sectional area of said capillary channel.
Claim 5
Dependent Claim
30 words
A nozzle as set forth in claim 1, wherein said elongated molded piece is in the form of a rod having a groove or projection formed on its peripheral surface.
Claim 6
Dependent Claim
18 words
A nozzle as set forth in claim 1, wherein said elongated molded piece is formed of a metal.
Claim 7
Dependent Claim
158 words
A die plate for melt-spinning a pitch fiber from mesophase pitch having a plurality of nozzles therein, each of said nozzles comprising: a capillary defining an elongated capillary channel along a predetermined axis for forming said pitch fiber; a counterbore orifice of greater cross sectional dimension that that of said capillary channel aligned therewith, said orifice defining a cavity having an inner surface; and an elongated molded piece dimensioned so as not to contact said capillary and so as to be centrally received within said cavity with a predetermined spacing between said molded piece and said inner surface, said spacing defining an annular pitch flow path communicating with said capillary channel, said molded piece having a contoured outer surface including a ridge or groove thereon, said groove or projection disposed within said counterbore orifice operative to orient the molecular structure of said pitch as it flow thereover to produce a fiber having a random or onion-skin cross-sectional structure.
Claim 8
Dependent Claim
158 words
A die plate for melt-spinning a pitch fiber from mesophase pitch having a plurality of nozzles therein, each of said nozzles comprising: a capillary defining an elongated capillary channel along a predetermined axis for forming said pitch fiber; a counterbore orifice of greater cross sectional dimension that that of said capillary channel aligned therewith, said orifice defining a cavity having an inner surface; and an elongated molded piece dimensioned so as not to contact said capillary and so as to be centrally received within said cavity with a predetermined spacing between said molded piece and said inner surface, said spacing defining an annular pitch flow path communicating with said capillary channel, said molded piece having a contoured outer surface including a ridge or groove thereon, said groove or projection disposed within said counterbore orifice operative to orient the molecular structure of said pitch as it flow thereover to produce a fiber having a random or onion-skin cross-sectional structure.
Claim 9
Dependent Claim
51 words
A die plate as defined in claim 6 wherein said plate includes a fixing plate associated, therewith, said fixing plate including a plurality of holes positioned in registry with said nozzles, said fixing holes adapted to receive said molded pieces and position said pieces within said counterbore orifices in said dieplate.
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |