US4572813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fine carbon fibers in a gaseous phase reaction
Assignee: Nikkiso Co Ltd
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Filing: 1984-08-08
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Granted: 1986-02-25
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Expires: 2004-08-08
Abstract
Abstract A process of preparing carbon fibers in a floating state by reacting a mixed gas consisted of a gas of organic metal compound or compounds, a carrier gas and desirably a gas of carbon compound or compounds at the elevated temperature of 600 DEG to 1300 DEG C. is disclosed, in which the fine carbon fibers having a diameter of 0.05 to 2 mu m, a length of 2 to 3000 mu m and an aspect ratio of 2 to 30,000 as well as a high degree of preferred orientation of carbon layers may be produced in a high yield and a high productivity.
Inventors
- 👤 Kohei Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:47
CPC Classifications
B; B82; B82Y; B82Y30/00; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1271; D01F9/1272; D01F9/1273; D01F9/1275; D01F9/1276; D01F9/1278
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
In a process for preparing fine carbon fibers in a gaseous phase reaction, the improvement consisting in that a gas mixture consisting of a gas of organic metal compound or compounds and a carrier gas is subjected to elevated temperatures, said organic metal compound at said elevated temperatures decomposing to form a metal catalyst which induces growth of carbon fibers in a floating state, and continuously recovering the carbon fibers.
Claim 2
Dependent Claim
70 words
In a process for preparing fine carbon fibers in a gaseous phase reaction, the improvement consisting in that a gas mixture consisting of a gas of organic metal compound or compounds and a carrier gas is subjected to elevated temperatures, said organic metal compound at said elevated temperatures decomposing to form a metal catalyst which induces growth of carbon fibers in a floating state, and continuously recovering the carbon fibers.
Claim 3
Dependent Claim
73 words
A process for preparing fine carbon fibers in a gaseous phase reaction, characterized in that a gas mixture, consisting of a gas of organic metal compound or compounds, a gas of carbon compound and a carrier gas, is subjected to elevated temperatures, said organic metal compound decomposing when subjected to said elevated temperatures to form a catalyst which induces growth of carbon fibers in a floating state, and continuously recovering the carbon fibers.
Claim 4
Dependent Claim
73 words
A process for preparing fine carbon fibers in a gaseous phase reaction, characterized in that a gas mixture, consisting of a gas of organic metal compound or compounds, a gas of carbon compound and a carrier gas, is subjected to elevated temperatures, said organic metal compound decomposing when subjected to said elevated temperatures to form a catalyst which induces growth of carbon fibers in a floating state, and continuously recovering the carbon fibers.
Claim 5
Dependent Claim
18 words
A process according to claim 1 or 2, wherein the organic metal compound contains Fe, Co and/or Ni.
Claim 6
Dependent Claim
20 words
A process according to claim 1 or 2, wherein the organic metal compound consists only of carbon, hydrogen and iron.
Claim 7
Dependent Claim
24 words
A process according to claim 1 or 2, wherein the carrier gas is a mixed gas containing more than 60% of H 2 gas.
Claim 8
Dependent Claim
24 words
A process according to claim 1 or 2, wherein the carrier gas is H 2 gas containing 1 to 5% of H 2 S.
Claim 9
Dependent Claim
36 words
A process according to claim 1 or 2, wherein the carrier gas is H 2 gas containing 3 to 20% of other gas selected from He, Ar, Kr, Ne, N 2 , and CO 2 .
Claim 10
Dependent Claim
51 words
A process according to claim 2, wherein a solution of the carbon compound having dissolved the organic metal compound or compounds therein is vaporized to form a mixed gas of the carbon compound with the organic metal compound or compounds having the same composition as said solution on the elemental basis.
Claim 11
Dependent Claim
21 words
A process according to claim 1 or 2, wherein the mixed gas is reacted at the temperature of 600°to 1300° C.
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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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |