US4376747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling the cross-sectional structure of mesophase pitch derived fibers
Assignee: BP Corp North America Inc
•
Filing: 1980-12-11
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Granted: 1983-03-15
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Expires: 2000-12-11
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
2026-10-30 01:04
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/32; D01F9/322
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
78 words
In the process of producing a continuous carbon fiber from mesophase pitch, including the steps of spinning a pitch fiber having a diameter of less than about 60 microns from the mesophase pitch by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, the improvement comprises positioning a porous body in the spinnerette channel.
Claim 2
Dependent Claim
78 words
In the process of producing a continuous carbon fiber from mesophase pitch, including the steps of spinning a pitch fiber having a diameter of less than about 60 microns from the mesophase pitch by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, the improvement comprises positioning a porous body in the spinnerette channel.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein said porous body is a porous metal or a porous ceramic.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein said porous body is positioned spaced away from the exit opening of said spinnerette channel.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein said porous body is positioned near the exit opening of said spinnerette channel.
Claim 6
Dependent Claim
13 words
The process of claim 4, wherein said spinnerette channel has a conical portion.
Claim 7
Dependent Claim
15 words
The process of claim 5, wherein said porous body is positioned in said conical portion.
Claim 8
Dependent Claim
16 words
The process of claim 5, wherein said porous body is positioned adjacent to said conical portion.
Claim 9
Dependent Claim
51 words
In the process of producing a mesophase pitch fiber including the spinning of mesophase pitch into a fiber using a spinnerette by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of the spinnerette, the improvement comprises positioning a porous body in the spinnerette channel.
Claim 10
Dependent Claim
51 words
In the process of producing a mesophase pitch fiber including the spinning of mesophase pitch into a fiber using a spinnerette by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of the spinnerette, the improvement comprises positioning a porous body in the spinnerette channel.
Claim 11
Dependent Claim
17 words
The process of claim 8, wherein said porous body is a porous metal or a porous ceramic.
Claim 12
Dependent Claim
21 words
The process of claim 8, wherein said porous body is positioned spaced away from the exit opening of said spinnerette channel.
Claim 13
Dependent Claim
19 words
The process of claim 8, wherein said porous body is positioned near the exit opening of said spinnerette channel.
Claim 14
Dependent Claim
13 words
The process of claim 11, wherein said spinnerette channel has a conical portion.
Claim 15
Dependent Claim
15 words
The process of claim 12, wherein said porous body is positioned in said conical portion.
Claim 16
Dependent Claim
16 words
The process of claim 12, wherein said porous body is positioned adjacent to said conical portion.
Claim 17
Dependent Claim
77 words
In the process of producing carbon fiber from mesophase pitch, including the steps of spinning a pitch fiber from the mesophase pitch by passing the mesophase pitch through a spinnerette channel defined between inside and outside surfaces of a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, the improvement comprises maintaining a roughened interior surface of said spinnerette channel in the vicinity of the outer surface of said spinnerette.
Claim 18
Dependent Claim
77 words
In the process of producing carbon fiber from mesophase pitch, including the steps of spinning a pitch fiber from the mesophase pitch by passing the mesophase pitch through a spinnerette channel defined between inside and outside surfaces of a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, the improvement comprises maintaining a roughened interior surface of said spinnerette channel in the vicinity of the outer surface of said spinnerette.
Claim 19
Dependent Claim
72 words
In the process of producing a continuous mesophase pitch fiber including the spinning of mesophase pitch into a fiber having a diameter of less than about 60 microns using a spinnerette by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of the spinnerette, the improvement comprises maintaining a roughened interior surface of said spinnerette channel in the vicinity of the outer surface of said spinnerette.
Claim 20
Dependent Claim
72 words
In the process of producing a continuous mesophase pitch fiber including the spinning of mesophase pitch into a fiber having a diameter of less than about 60 microns using a spinnerette by passing the mesophase pitch through a spinnerette channel defined between the inside and outside surfaces of the spinnerette, the improvement comprises maintaining a roughened interior surface of said spinnerette channel in the vicinity of the outer surface of said spinnerette.
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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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |