US4861653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitch carbon fibers and batts
Assignee: University of Tennessee Research Foundation
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Filing: 1987-09-02
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Granted: 1989-08-29
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Expires: 2007-09-02
Abstract
Abstract Mesophase pitch centrifugally spun as described over a lip yields upon stabilization and carbonization with or without graphitization carbon fibers with a lamellar microstructure.
Inventors
- 👤 Robert G. Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/74; D01; D01D; D01D5/00; D01D5/18; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/15; D01F9/155; D01F9/32; D01F9/322; D04H1/40; D04H1/42; D04H1/4209; D04H1/4242; D06; D06C; D06C7/00; D06C7/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/30; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/624; Y10T442/681; Y10T442/69; Y10T442/691
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A batt of randomly disposed carbon fibers, said fibers predominantly having in cross-section a width of less than about 12 micrometers and a fracture surface exhibiting a lamellar microstructure composed of lamellae arranged in an isoclinic relationship and disposed in a direction generally parallel to an axis of the fiber cross-section, the lamellae extending to the periphery of the fiber cross-sections.
Claim 2
Dependent Claim
61 words
A batt of randomly disposed carbon fibers, said fibers predominantly having in cross-section a width of less than about 12 micrometers and a fracture surface exhibiting a lamellar microstructure composed of lamellae arranged in an isoclinic relationship and disposed in a direction generally parallel to an axis of the fiber cross-section, the lamellae extending to the periphery of the fiber cross-sections.
Claim 3
Dependent Claim
14 words
A batt according to claim 1 wherein the fibers are bonded to each other.
Claim 4
Dependent Claim
14 words
A composite reinforced with the batt of claim 1 or 2 or fragments thereof.
Claim 5
Dependent Claim
18 words
A batt according to claim 1 formed from centrifugally spun mesophase pitch which was oxidatively stabilized and carbonized.
Claim 6
Dependent Claim
92 words
A process for preparing the batt of randomly disposed carbon fibers comprising centrifugally spinning a molten mesophase pitch, said pitch being spun at a temperature of from 375° C. to 525° C. over the lip of a rotor and into a chamber, at a centrifugal force of from 200 to 15,000 g., quenching the spun fiber in the chamber and directing the fiber on to a collection means to form a batt of randomly disposed pitch carbon fiber, oxidatively stabilizing the fiber of the batt and carbonizing the fiber of the batt.
Claim 7
Dependent Claim
92 words
A process for preparing the batt of randomly disposed carbon fibers comprising centrifugally spinning a molten mesophase pitch, said pitch being spun at a temperature of from 375° C. to 525° C. over the lip of a rotor and into a chamber, at a centrifugal force of from 200 to 15,000 g., quenching the spun fiber in the chamber and directing the fiber on to a collection means to form a batt of randomly disposed pitch carbon fiber, oxidatively stabilizing the fiber of the batt and carbonizing the fiber of the batt.
Claim 8
Dependent Claim
20 words
A process according to claim 5 wherein the pitch is spun at a centrifugal force of at least 1000 g.
Claim 9
Dependent Claim
18 words
A process according to claim 5 wherein the fiber of the batt is self-bonded during the oxidative stabilization.
Claim 10
Dependent Claim
9 words
A batt prepared by the process of claim 5.
References Cited (Backward Citations)
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |