US4640830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fine fibers
Assignee: Nikkiso Co Ltd
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Filing: 1985-09-09
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Granted: 1987-02-03
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Expires: 2005-09-09
Abstract
Abstract A process for preparing fine fibers (or whiskers) consisting of carbon and silicon is disclosed, in which a mixed gas of transition metal compound(s), organo-silicon compound(s) and optionally carbon compound(s) is reacted at a high temperature, such as in the range of 700 DEG to 1,450 DEG C.
Inventors
- 👤 Kohei Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:49
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
In a process for preparing fine fibers consisting of carbon and silicon in a gaseous phase reaction, the improvement comprising subjecting a gas mixture comprising at least one transistion metal compound gas, at least one organo-silicon compound gas and at least one carbon compound gas to an elevated temperature, said transition metal compound decomposing at the elevated temperature to form metal catalyst in a floating state which induces growth of fine fibers in a floating state, said fine fibers being continuously recovered.
Claim 2
Dependent Claim
82 words
In a process for preparing fine fibers consisting of carbon and silicon in a gaseous phase reaction, the improvement comprising subjecting a gas mixture comprising at least one transistion metal compound gas, at least one organo-silicon compound gas and at least one carbon compound gas to an elevated temperature, said transition metal compound decomposing at the elevated temperature to form metal catalyst in a floating state which induces growth of fine fibers in a floating state, said fine fibers being continuously recovered.
Claim 3
Dependent Claim
76 words
In a process for preparing fine fibers consisting of carbon and silicon in a gaseous phase reaction, the improvement comprising subjecting a gas mixture comprising at least one transition metal compound gas and at least one organo-silicon compound gas to an elevated temperature said transition metal compound decomposing at the elevated temperature to form metal catalyst in a floating state which induces growth of fine fibers in a floating state, said fine fibers being continuously recovered.
Claim 4
Dependent Claim
76 words
In a process for preparing fine fibers consisting of carbon and silicon in a gaseous phase reaction, the improvement comprising subjecting a gas mixture comprising at least one transition metal compound gas and at least one organo-silicon compound gas to an elevated temperature said transition metal compound decomposing at the elevated temperature to form metal catalyst in a floating state which induces growth of fine fibers in a floating state, said fine fibers being continuously recovered.
Claim 5
Dependent Claim
35 words
A process according to claim 1 or 2 wherein the gas mixture is subjected to an elevated temperature in a reaction zone that is at a temperature in the range of 700° to 1,450° C.
Claim 6
Dependent Claim
21 words
A process according to claim 1 or 2 wherein a metal of said transistion metal compoind is Fe, Ni or Co.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the transition metal compound is an organo-transition metal compound.
Claim 8
Dependent Claim
16 words
A process according to claim 2, wherein the transition metal compound is an organo-transition metal compound.
Claim 9
Dependent Claim
16 words
A process according to claim 3, wherein the transition metal compound is an organo-transition metal compound.
Claim 10
Dependent Claim
16 words
A process according to claim 4, wherein the transition metal compound is an organo-transition metal compound.
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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) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |