Patent US4504454A successfully refreshed from Google Patents.
US4504454A
Expired / Lapsed
US
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Process of spinning pitch-based carbon fibers
Assignee: ConocoPhillips Co
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Filing: 1983-03-28
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Granted: 1985-03-12
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Expires: 2003-03-28
Abstract
Abstract This invention features an improved spinning process for pitch-based carbon fibers, that will provide a continuous pitch-based carbon fiber having a uniform pattern of graphite crystallites over a substantial portion of the fiber cross-section and/or aligned along the fiber axis in the form of undulating ribbons. Continuous carbon fibers having the preferred orientation of graphite crystallites will exhibit greater mechanical properties.
Inventors
- 👤 Dennis M. Riggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:24
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01D; D01D5/00; D01D5/08; D01F9/145; D01F9/32; D01F9/322
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially ordered graphite crystallite orientation and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said ordered crystallite orientation and said longitudinal alignment.
Claim 2
Independent Claim
87 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially ordered graphite crystallite orientation and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said ordered crystallite orientation and said longitudinal alignment.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said minimum viscosity at spin reversal is maintained by decreasing the spinning temperature.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said minimum viscosity at spin reversal is maintained by increasing the viscosity of prespun pitch feed material.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein said minimum viscosity at spin reversal is maintained by increasing the flow rate of the precursor feed material through said spinnerette capillaries and by increasing the diameters of said spinnerette capillaries.
Claim 6
Independent Claim
88 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially onion skin textured cross-section and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said onion skin textured cross-section and said longitudinal alignment.
Claim 7
Independent Claim
88 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially onion skin textured cross-section and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said onion skin textured cross-section and said longitudinal alignment.
Claim 8
Dependent Claim
19 words
The method of claim 5 wherein said minimum viscosity at spin reversal is maintained by decreasing the spinning temperature.
Claim 9
Dependent Claim
24 words
The method of claim 5 wherein said minimum viscosity at spin reversal is maintained by increasing the viscosity of the pre-spun pitch feed material.
Claim 10
Dependent Claim
36 words
The method of claim 5 wherein said minimum viscosity at spin reversal is maintained by increasing the flow rate of the precursor feed material through spinnerette capillaries and by increasing the diameters of said spinnerette capillaries.
Claim 11
Independent Claim
86 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially radial textured cross-section and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said radial textured cross-section and said longitudinal alignment.
Claim 12
Independent Claim
86 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fiber having a substantially radial textured cross-section and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said radial textured cross-section and said longitudinal alignment.
Claim 13
Dependent Claim
19 words
The method of claim 9 wherein said minimum viscosity at spin reversal is maintained by decreasing the spinning temperature.
Claim 14
Dependent Claim
23 words
The method of claim 9 wherein said minimum viscosity at spin reversal is maintained by increasing the viscosity of pre-spun pitch feed material.
Claim 15
Dependent Claim
36 words
The method of claim 9 wherein said minimum viscosity at spin reversal is maintained by increasing the flow rate of the precursor feed material through spinnerette capillaries and by increasing the diameters of said spinnerette capillaries.
Claim 16
Independent Claim
87 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fibers having a substantially ordered graphite crystallite orientation and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said ordered crystallite orientation and said longitudinal alignment.
Claim 17
Independent Claim
87 words
A method of spinning a pitch precursor feed material to produce a continuous pitch-base carbon fibers having a substantially ordered graphite crystallite orientation and a longitudinal alignment comprising undulating ribbons, which comprises spinning a mesophase pitch precursor feed material through open spinnerette capillaries, internally free of porous bodies, under such conditions that a fiber carrot formed during said spinning will have a minimum maintained viscosity of at least 2300 poises at spin reversal to produce as-spun carbon fibers having said ordered crystallite orientation and said longitudinal alignment.
Claim 18
Dependent Claim
19 words
The method of claim 13 wherein said minimum viscosity at spin reversal is maintained by decreasing the spinning temperature.
Claim 19
Dependent Claim
23 words
The method of claim 13 wherein said minimum viscosity at spin reversal is maintained by increasing the viscosity of pre-spun pitch feed material.
Claim 20
Dependent Claim
36 words
The method of claim 13 wherein said minimum viscosity at spin reversal is maintained by increasing the flow rate of the precursor feed material through spinnerette capillaries and by increasing the diameters of said spinnerette capillaries.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |