Patent US3019977A successfully refreshed from Google Patents.
US5028451A
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Method of producing sintered hard metal with diamond film
Assignee: Niterra Co Ltd
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Filing: 1990-03-02
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Granted: 1991-07-02
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Expires: 2010-03-02
Abstract
Abstract The present invention is directed to a method of producing a sintered hard metal having a diamond film wherein a gas that is obtained by activating a raw material gas containing 2 to 60 mol % of carbon monoxide and hydrogen gas is brought in contact with a sintered hard metal to form a diamond film, thereby a diamond film can be formed on said sintered hard metal with the adhesion of the diamond excellent.
Inventors
- 👤 Toshimichi Ito
- 👤 Satoshi Katsumata
- 👤 Masakazu Watanabe
- 👤 Satoshi Iio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:48
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C16/27; C23C16/274; C23C16/02; C23C16/0272; C23C16/0281; C23C16/277; C30; C30B; C30B25/00; C30B25/02; C30B29/00; C30B29/02; C30B29/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method of producing a sintered hard metal having a diamond film, characterized in that a gas that is obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas is brought in contact with a sintered hard metal to form a diamond film, wherein said sintered hard metal has a surface layer made of at least one element selected from the group consisting of Si and metals of Group IVa, Va or VIa.
Claim 2
Independent Claim
81 words
A method of producing a sintered hard metal having a diamond film, characterized in that a gas that is obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas is brought in contact with a sintered hard metal to form a diamond film, wherein said sintered hard metal has a surface layer made of at least one element selected from the group consisting of Si and metals of Group IVa, Va or VIa.
Claim 3
Dependent Claim
39 words
A method of producing a sintered hard metal having a diamond film as claimed in claim 1, characterized in that the metal species of said sintered hard metal and the metal species of said surface layer are the same.
Claim 4
Dependent Claim
34 words
A method of producing a sintered hard metal having a diamond film as claimed in claim 1, characterized in that the major component of the metal species in said sintered hard metal is tungsten.
Claim 5
Dependent Claim
31 words
A method of producing a sintered hard metal having a diamond film as claimed in claim 1, characterized in that the thickness of said surface layer is 0.05 to 1 μm.
Claim 6
Dependent Claim
30 words
A method of producing a sintered hard metal having a diamond film as claimed in claim 1, characterized in that said surface layer is formed by a vacuum deposition process.
Claim 7
Dependent Claim
34 words
A method of producing a sintered hard metal having a diamond film as claimed in claim 1, characterized in that the activation of said raw material gas is effected by a plasma decomposition process.
Claim 8
Dependent Claim
103 words
A sintered hard metal having a diamond film, characterized by comprising a sintered hard metal, a surface layer formed by bringing a gas obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas in contact with a layer made on said sintered hard metal, of at least one element selected from the group consisting of Si and metals of Group IVa, Va or VIa and Si having a thickness in the range of 0.05 to 1 μm and a diamond film formed on said surface layer and having a thickness of 0.2 to 100 μm.
Claim 9
Dependent Claim
103 words
A sintered hard metal having a diamond film, characterized by comprising a sintered hard metal, a surface layer formed by bringing a gas obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas in contact with a layer made on said sintered hard metal, of at least one element selected from the group consisting of Si and metals of Group IVa, Va or VIa and Si having a thickness in the range of 0.05 to 1 μm and a diamond film formed on said surface layer and having a thickness of 0.2 to 100 μm.
Claim 10
Dependent Claim
20 words
A cutting tool characterized by being provided with said sintered hard metal with a diamond film according to claim 7.
Claim 11
Dependent Claim
42 words
A cutting tool having diamond film, characterized by that said diamond film is formed by bringing gas obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas in contact with a sintered hard metal.
Claim 12
Dependent Claim
42 words
A cutting tool having diamond film, characterized by that said diamond film is formed by bringing gas obtained by activating a raw material gas containing 2 to 60 mol % carbon monoxide and hydrogen gas in contact with a sintered hard metal.
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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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |