US5102647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing vapor growth carbon fibers
Assignee: Resonac Holdings Corp
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Filing: 1990-12-21
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Granted: 1992-04-07
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Expires: 2010-12-21
Abstract
Abstract A method of producing vapor growth carbon fibers which are grown in a rection space by thermally decomposing gaseous hydrocarbon and by using transition metal fine particles as the catalyst, wherein the reaction space is filled with ceramic granules which serve as a radiation heat transfer medium and are moved to prevent an intermingling of the growing carbon fibers, so that the grown carbon fibers are conveyed from the reaction space by a gas stream.
Inventors
- 👤 Hirokazu Yamada
- 👤 Yukio Fukuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:52
CPC Classifications
B; B82; B82Y; B82Y30/00; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A method of producing vapor growth carbon fibers which comprises growing carbon fibers in a reaction space of a reactor by thermally decomposing gaseous hydrocarbon and by using transition metal fine particles as a catalyst, wherein said reaction space is filled with ceramic granules which serve as a radiation heat transfer medium and are moved so as to form a fluidized bed, a moving bed, or a rotary bed to prevent an intermingling of growing carbon fibers, so that said vapor growth carbon fibers are conveyed from said reactor by a gas stream while the ceramic granules remain in said reactor.
Claim 2
Independent Claim
101 words
A method of producing vapor growth carbon fibers which comprises growing carbon fibers in a reaction space of a reactor by thermally decomposing gaseous hydrocarbon and by using transition metal fine particles as a catalyst, wherein said reaction space is filled with ceramic granules which serve as a radiation heat transfer medium and are moved so as to form a fluidized bed, a moving bed, or a rotary bed to prevent an intermingling of growing carbon fibers, so that said vapor growth carbon fibers are conveyed from said reactor by a gas stream while the ceramic granules remain in said reactor.
Claim 3
Dependent Claim
34 words
A method according to claim 1, wherein said transition metal fine particles are formed by thermally decomposing an evaporating gas selected from the group consisting of transition metal compounds and organic transition metal compounds.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein said ceramic granules are selected from the group consisting of mullite, alumina, and zirconia.
Claim 5
Dependent Claim
30 words
A method according to claim 1, wherein said ceramic granules are present in a rotary bed type reactor and have an average particle diameter of from 100 to 0.01 mm.
Claim 6
Dependent Claim
30 words
A method according to claim 1, wherein said ceramic granules are present in a fluidized bed type reactor and have an average particle diameter of from 10 to 0.01 mm.
Claim 7
Dependent Claim
21 words
A method according to claim 5, wherein said ceramic granules have an average particle diameter of from 5 to 0.05 mm.
Claim 8
Dependent Claim
14 words
A method according to claim 1, wherein said ceramic granules form a fluidized bed.
Claim 9
Dependent Claim
14 words
A method according to claim 1, wherein said ceramic granules form a moving bed.
Claim 10
Dependent Claim
20 words
A method according to claim 1, wherein said ceramic granules form a rotating bed by using a rotating reactor vessel.
References Cited (Backward Citations)
US2846370A
Cited
US3459655A
Cited
US3490870A
Cited
US3867513A
Cited
JPS546891A
Cited
JPS56118913A
Cited
US4394350A
Cited
US4565683A
Cited
CA1175616A
Cited
JPS57117622A
Cited
JPS5822571A
Cited
JPS58110493A
Cited
US4650657A
Cited
US4767737A
Cited
US4518575A
Cited
US4435376A
Cited
JPS59223299A
Cited
US4572813A
Cited
JPS60181319A
Cited
JPS62242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |