US4480977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the cross-sectional structure of mesophase pitch derived fibers
Assignee: BP Corp North America Inc
•
Filing: 1983-03-11
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Granted: 1984-11-06
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Expires: 2003-03-11
Abstract
Abstract A mesophase pitch derived fiber having a predetermined cross-sectional structure is produced by passing mesophase pitch being spun into a pitch fiber through a porous body positioned in the spinnerette channel of a spinnerette.
Inventors
- 👤 Faramarz Nazem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:06
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01D; D01D4/00; D01D4/02; D01F9/32; D01F9/322
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A spinnerette for spinning a continous pitch fiber from mesophase pitch, comprising a reservoir for the mesophase pitch, heating means for heating the mesophase pitch in said reservoir, pressing means for exerting pressure on said mesophase pitch, outlet means comprising a spinnerette channel through which said mesophase pitch communicates from said reservoir to the outside of said spinnerette to form said pitch fiber, and a porous body positioned near the exit opening of said spinnerette channel.
Claim 2
Dependent Claim
76 words
A spinnerette for spinning a continous pitch fiber from mesophase pitch, comprising a reservoir for the mesophase pitch, heating means for heating the mesophase pitch in said reservoir, pressing means for exerting pressure on said mesophase pitch, outlet means comprising a spinnerette channel through which said mesophase pitch communicates from said reservoir to the outside of said spinnerette to form said pitch fiber, and a porous body positioned near the exit opening of said spinnerette channel.
Claim 3
Dependent Claim
17 words
The spinnerette of claim 1, wherein said porous body is a porous metal or a porous ceramic.
Claim 4
Dependent Claim
13 words
The spinnerette of claim 1, wherein said spinnerette channel has a conical portion.
Claim 5
Dependent Claim
15 words
The spinnerette of claim 3, wherein said porous body is positioned in said conical portion.
Claim 6
Dependent Claim
16 words
The spinnerette of claim 4, wherein said porous body is positioned adjacent to said conical portion.
References Cited (Backward Citations)
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Cited
US3074104A
Cited
US3421181A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |