Patent US5116694A successfully refreshed from Google Patents.
US5116694A
Expired / Lapsed
US
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Coated cemented carbides
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1991-06-03
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Granted: 1992-05-26
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Expires: 2011-06-03
Abstract
Abstract A coated cemented carbide with an improved wear resistance without lowering the toughness as a tool is provided comprising a substrate of a cemented carbide, the surface of which is coated with a multilayer of TiC, TiN and TiCN by the PVD method, the innermost layer in contact with the substrate being a TiN layer with a thickness of 0.1 to 1 mu m.
Inventors
- 👤 Hiroshi Tsukada
- 👤 Masaaki Tobioka
- 👤 Toshio Nomura
- 👤 Yasuhiro Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:15
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0664; C23C14/0635; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A coated cemented carbide comprising a substrate of a cemented carbide, the surface of which is coated with a multilayer coating having a total thickness of 1 to 10 μm, formed by a PVD method, consisting of: an innermost layer of TiN having a thickness of 0.1 to 0.8 in contact with said substrate, at least one layer selected from the group consisting of a TiC layer and a TiCN layer having a total thickness of 1 to 5 μm in contact with said innermost layer, wherein when both said TiC and TiCN layers are present, said TiC layer is in contact with said innermost layer, and optionally an outermost layer of TiN having a thickness of 0.3 to 5 μm.
Claim 2
Dependent Claim
121 words
A coated cemented carbide comprising a substrate of a cemented carbide, the surface of which is coated with a multilayer coating having a total thickness of 1 to 10 μm, formed by a PVD method, consisting of: an innermost layer of TiN having a thickness of 0.1 to 0.8 in contact with said substrate, at least one layer selected from the group consisting of a TiC layer and a TiCN layer having a total thickness of 1 to 5 μm in contact with said innermost layer, wherein when both said TiC and TiCN layers are present, said TiC layer is in contact with said innermost layer, and optionally an outermost layer of TiN having a thickness of 0.3 to 5 μm.
Claim 3
Dependent Claim
27 words
The coated cemented carbide of claim 1, wherein the multilayer coating consists of a first layer of TiN, second layer of TiC and third layer of TiCN.
Claim 4
Dependent Claim
27 words
The coated cemented carbide of claim 1, wherein the multilayer coating consists of a first layer of TiN, second layer of TiC and third layer of TiN.
Claim 5
Dependent Claim
27 words
The coated cemented carbide of claim 1, wherein the multilayer coating consists of a first layer of TiN, second layer of TiCN and third layer of TiN.
Claim 6
Dependent Claim
31 words
The coated cemented carbide of claim 1, wherein the multilayer coating consists of a first layer of TiN, second layer of TiC, third layer of TiCN and fourth layer of TiN.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |