US4301135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning pitch fiber into a hot gaseous environment
Assignee: BP Corp North America Inc
•
Filing: 1979-12-26
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Granted: 1981-11-17
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Expires: 1999-12-26
Abstract
Abstract In the process of producing a carbon fiber from mesophase pitch, including the steps of spinning the pitch fiber from a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, wherein the improvement comprises spinning the pitch fiber into a hot gaseous environment.
Inventors
- 👤 Faramarz Nazem
- 👤 Robert C. Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/32; D01F9/322; D01F9/145
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
In a process of producing a carbon fiber from mesophase pitch having at least about 70% by weight mesophase, including the steps of spinning a pitch fiber from the mesophase pitch using a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, wherein the improvement comprises spinning the pitch fiber into an inert gaseous environment having a temperature of from about 150° C. to about 400° C.
Claim 2
Dependent Claim
74 words
In a process of producing a carbon fiber from mesophase pitch having at least about 70% by weight mesophase, including the steps of spinning a pitch fiber from the mesophase pitch using a spinnerette, thermosetting the pitch fiber, and thereafter, carbonizing the pitch fiber to produce the carbon fiber, wherein the improvement comprises spinning the pitch fiber into an inert gaseous environment having a temperature of from about 150° C. to about 400° C.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein said gaseous environment is nitrogen.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein the spinning has a draw-down ratio in the range of about 12:1 to about 1470:1.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein gas for the said gaseous environment is supplied at the rate from about 0.1 to about 30 cubic feet per hour.
Claim 6
Dependent Claim
19 words
The process of claim 4, further comprising preheating said gas before said gas is introduced into said gaseous environment.
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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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |