US4051659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carbon fibre
Assignee: Morganite Modmor Ltd
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Filing: 1976-02-17
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Granted: 1977-10-04
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Expires: 1996-02-17
Abstract
Abstract Production of carbon fibre from a multifilament tow of organic precursor fibre, by heat treatment in an oxygen containing atmosphere and subsequent carbonization optionally followed by graphitization, the tow being given a twist between the oxygen treatment and carbonization, which twist is made permanent by the carbonization and maintains the fibres within the tow during the carbonization and subsequent handling.
Inventors
- 👤 Harold Dennis Blakelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:19
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F9/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
In the production of carbon fibre from a multifilament tow of organic precursor fibre, by heat treatment in an oxygen containing atmosphere and subsequent carbonisation optionally followed by graphitisation, the improvement comprising giving the tow a twist between the oxygen treatment and carbonisation, which twist is made permanent by the carbonisation and maintains the fibres within the tow during the carbonisation and subsequent handling.
Claim 2
Dependent Claim
64 words
In the production of carbon fibre from a multifilament tow of organic precursor fibre, by heat treatment in an oxygen containing atmosphere and subsequent carbonisation optionally followed by graphitisation, the improvement comprising giving the tow a twist between the oxygen treatment and carbonisation, which twist is made permanent by the carbonisation and maintains the fibres within the tow during the carbonisation and subsequent handling.
Claim 3
Dependent Claim
116 words
In the production of carbon fibre according to claim 1, from a multifilament tow of 2,000 to 20,000, 0.5 to 5 denier filaments of organic precursor fibre, by heat treatment in an oxygen-containing atmosphere at 200 to 300° C for 1 to 3 hours under tension a least sufficient to prevent shrinkage of the fibre by more than 5%, subsequent carbonisation at 1000° to 2000° C, and optionally graphitisation at 2000° to 3000° C, the improvement wherein the tow is given a twist of 10 to 130 turns/meter between the oxygen treatment and the carbonisation, which twist is made permanent by the carbonisation and maintains the fibres within the tow during the carbonisation and subsequent handling.
Claim 4
Dependent Claim
16 words
Production of carbon fibres according to claim 2, wherein the twist is 50 to 120 turns/meter.
Claim 5
Dependent Claim
18 words
Production of carbon fibre according to claim 2, wherein the precursor is a polymer or copolymer of acrylonitrile.
Claim 6
Dependent Claim
17 words
Production of carbon fiber as claimed in claim 2 wherein the twist is 70 to 120 turns/meter.
Claim 7
Dependent Claim
22 words
A tow of carbon fibre, made by the method of claim 1, having a permanent twist maintaining the fibres within the tow.
Claim 8
Dependent Claim
27 words
A tow, according to claim 6, of 2,000 to 20,000 carbon fibres having a permanent twist of 10 to 130 turns/meter maintaining the fibre within the tow.
Claim 9
Dependent Claim
14 words
A tow according to claim 7, wherein the twist is 50 to 120, turns/meter.
Claim 10
Dependent Claim
15 words
A tow is claimed in claim 7 wherein the twist is 70 to 120 turns/meter.
Claim 11
Dependent Claim
15 words
Carbon fibre in woven or braided form, made from a tow according to claim 6.
Claim 12
Dependent Claim
28 words
Carbon fiber in the form of a continuous filament tow having a permanent twist maintaining the fibers within the tow, and made by the method of claim 1.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |