US5039504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing graphite whiskers
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-12-20
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Granted: 1991-08-13
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Expires: 2009-12-20
Abstract
Abstract There is provided a process for producing graphite whiskers by supplying a carbon source compound with a carrier gas into a heating zone in a reactor and decomposing the carbon source compound in a gas phase in the presence of a catalyst, characterized in that the catalyst comprises ultrafine particles of a transition metal which have been obtained by the gas-phase thermal decomposition of a carbonyl compound of a transition metal in the presence of at least one organic compound containing oxygen and/or sulfur.
Inventors
- 👤 Yoshiteru Kageyama
- 👤 Yoshiaki Sawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:51
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1278; B; B82; B82Y; B82Y30/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A process for producing graphite whiskers by supplying a carbon source compound with a carrier gas into a heating zone in a reactor and decomposing said carbon source compound in a gas phase in the presence of a catalyst, characterized in that the catalyst comprises ultrafine particles of a transition metal which have been obtained by the gas-phase thermal decomposition of a carbonyl compound of a transition metal in the presence of at least 0.0001 to 0.1 mol % with respect to said carbonyl compound of one organic compound containing oxygen and/or sulfur.
Claim 2
Dependent Claim
93 words
A process for producing graphite whiskers by supplying a carbon source compound with a carrier gas into a heating zone in a reactor and decomposing said carbon source compound in a gas phase in the presence of a catalyst, characterized in that the catalyst comprises ultrafine particles of a transition metal which have been obtained by the gas-phase thermal decomposition of a carbonyl compound of a transition metal in the presence of at least 0.0001 to 0.1 mol % with respect to said carbonyl compound of one organic compound containing oxygen and/or sulfur.
Claim 3
Dependent Claim
30 words
The process according to claim 1, wherein the organic compound containing oxygen and/or sulfur is selected from the group consisting of alcohols, esters, ketones, ethers, mercaptans, thioethers and mixtures thereof.
Claim 4
Dependent Claim
33 words
The process according to claim 1, wherein the amount of the organic compound containing oxygen and/or sulfur is 0.001 to 0.05 mol % with respect to the carbonyl compound of a transition metal.
Claim 5
Dependent Claim
26 words
The process according to claim 1, wherein the gas-phase thermal decomposition of said carbonyl compound is carried out at a temperature of 300° to 1000° C.
Claim 6
Dependent Claim
31 words
The process according to claim 1, wherein the gas-phase thermal decomposition of said carbonyl compound is carried out for a residence time of 5 seconds or less in a reaction system.
Claim 7
Dependent Claim
23 words
The process according to claim 1, wherein the ultrafine particle of a transition metal have a particle size of 0.001 to 0.5 μm.
Claim 8
Dependent Claim
12 words
The process according to claim 4, wherein said temperature is 400°-700° C.
Claim 9
Dependent Claim
15 words
The process according to claim 5, wherein said residence time is 2 seconds or less.
Claim 10
Dependent Claim
15 words
The process according to claim 6, wherein said particle size is 0.05 to 0.1 μm.
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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) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |