US4981671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing diamond or diamond-like carbon by combustion flame
Assignee: National Institute for Materials Science
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Filing: 1989-02-09
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Granted: 1991-01-01
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Expires: 2009-02-09
Abstract
Abstract A method for preparing diamond or diamond-like carbon, which comprises exciting carbon by decomposing, evaporating and dissociating an organic compound or a carbon material in a combustion flame of at least 600° C. of a hydrocarbon, hydrogen or a mixture thereof and oxygen gas or air, mixing thereto hydrogen in an amount of at least one time by volume the amount of carbon, and maintaining the mixture at a temperature of from 600° to 1,700° C. to precipitate diamond or diamond-like carbon.
Inventors
- 👤 Yusuke Moriyoshi
- 👤 Masatsugu Futaki
- 👤 Seiichiro Matsumoto
- 👤 Takamasa Ishigaki
- 👤 Shojiro Komatsu
- 👤 Nobuo Setaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:28
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C16/27; C23C16/275; C01; C01B; C01B32/00; C01B32/25; C01B32/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A method for preparing diamond or diamond-like carbon, which comprises exciting carbon by decomposing, evaporating and dissociating an organic compound or a carbon material in a combustion flame of at least 600° C. of a hydrocarbon, hydrogen or a mixture thereof and oxygen gas or air, mixing thereto hydrogen in an amount of at least one time by volume the amount of carbon, and maintaining the mixture at a temperature of from 600° to 1,700° C. to precipitate diamond or diamond-like carbon.
Claim 2
Independent Claim
82 words
A method for preparing diamond or diamond-like carbon, which comprises exciting carbon by decomposing, evaporating and dissociating an organic compound or a carbon material in a combustion flame of at least 600° C. of a hydrocarbon, hydrogen or a mixture thereof and oxygen gas or air, mixing thereto hydrogen in an amount of at least one time by volume the amount of carbon, and maintaining the mixture at a temperature of from 600° to 1,700° C. to precipitate diamond or diamond-like carbon.
Claim 3
Dependent Claim
39 words
The method according to claim 1, wherein the mixture of excited carbon and hydrogen is blown against a substrate heated at a temperature of from 600° to 1,700° C. to precipitate diamond or diamond like carbon on the substrate.
Claim 4
Dependent Claim
34 words
The method according to claim 1, wherein hydrogen is mixed to excited carbon in an amount of from 1 to 45 times by volume the amount of the carbon to obtain diamond like carbon.
Claim 5
Dependent Claim
51 words
The method according to the claim 1, wherein hydrogen is mixed to excited carbon in an amount of at least 50 times by volume the amount of carbon, and the mixture of excited carbon and hydrogen is heated at a temperature of from 600° C. to 1,200° C., to obtain diamond.
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |