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Patent US4434188A successfully refreshed from Google Patents.
US4434188A
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Method for synthesizing diamond
Assignee: NATIONAL INSTITUTE
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Filing: 1982-11-17
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Granted: 1984-02-28
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Expires: 2002-11-17
Abstract
Abstract A method for synthesizing diamond wherein hydrogen gas which has passed through a micro-wave non-electrode discharge and mixed with hydrocarbon gas, or a mixture gas consisting of hydrocarbon and hydrogen after its passing through a micro-wave non-electrode discharge, is introduced onto the surface of a substrate heated to a temperature of from 300° to 1300° C. to decompose hydrocarbon in its energetically activated state for the diamond deposition.
Inventors
- 👤 Mutsukazu Kamo
- 👤 Seiichiro Matsumoto
- 👤 Yoichiro Sato
- 👤 Nobuo Setaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:51
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C16/27; C23C16/274
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A method for synthesizing diamond, characterized in that hydrogen gas which has passed through a micro-wave non-electrode discharge and mixed with hydrocarbon gas, or a mixture gas consisting of hydrocarbon and hydrogen after its passing through a micro-wave non-electrode discharge, is introduced onto the surface of a substrate heated to a temperature of from 300° to 1300° C. to decompose hydrocarbon in its energetically activated state for the diamond deposition.
Claim 2
Independent Claim
70 words
A method for synthesizing diamond, characterized in that hydrogen gas which has passed through a micro-wave non-electrode discharge and mixed with hydrocarbon gas, or a mixture gas consisting of hydrocarbon and hydrogen after its passing through a micro-wave non-electrode discharge, is introduced onto the surface of a substrate heated to a temperature of from 300° to 1300° C. to decompose hydrocarbon in its energetically activated state for the diamond deposition.
Claim 3
Independent Claim
91 words
A method for synthesizing diamond, characterized in that a micro-wave of 300 MHz and above is introduced into hydrogen gas or a mixture gas consisting of hydrogen gas and an inactive gas to generate a micro-wave plasma, then a substrate is placed in the micro-wave plasma thus generated to thereby heat the substrate to a temperature of from 300° to 1300° C. with the thus generated heat by the micro-wave plasma, and, at the same time, hydrocarbon is introduced onto the substrate, thereby depositing diamond on the surface of the substrate.
Claim 4
Independent Claim
91 words
A method for synthesizing diamond, characterized in that a micro-wave of 300 MHz and above is introduced into hydrogen gas or a mixture gas consisting of hydrogen gas and an inactive gas to generate a micro-wave plasma, then a substrate is placed in the micro-wave plasma thus generated to thereby heat the substrate to a temperature of from 300° to 1300° C. with the thus generated heat by the micro-wave plasma, and, at the same time, hydrocarbon is introduced onto the substrate, thereby depositing diamond on the surface of the substrate.
Claim 5
Dependent Claim
24 words
The method for synthesizing diamond according to claim 1, wherein a mixing ratio in volume of hydrocarbon to hydrogen ranges from 100 to 0.001.
Claim 6
Dependent Claim
24 words
The method for synthesizing diamond according to claim 2, wherein a mixing ratio in volume of hydrocarbon to hydrogen ranges from 500 to 0.001.
Claim 7
Dependent Claim
39 words
The method for synthesizing diamond according to claim 2, wherein a mixing ratio in volume of hydrocarbon to hydrogen and inactive gas ranges from 500 to 0.001, with a substitution of inactive gas to hydrogen being 50% or below.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |