Patent US4720437A successfully refreshed from Google Patents.
US4720437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface-coated cemented carbide article or part
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1986-03-21
•
Granted: 1988-01-19
•
Expires: 2006-03-21
Abstract
Abstract A cemented carbide article or part having a hard coating excellent in heat shielding effect and initial wear resistance is described in which the hard coating comprises an inner layer of TiC and an outer layer of TiC, and an intermediate layer, provided between the inner layer and outer layer, consisting of at least one layer selected from the group consisting of a single layer of TiN and a composite layer with such a structure that a TiN layer is sandwiched in between TiCN layers.
Inventors
- 👤 Masuo Chudo
- 👤 Toshio Nomura
- 👤 Toshihiro Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/34; C23C16/36; C23C16/40; C23C16/403; C23C28/00; C23C28/04; C23C28/044; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A surface-coated cemented carbide having a hard coating layer on the surface thereof, in which the hard coating layer comprises: an inner layer of TiC having a thickness of 0.5 to 2.5μ, a penultimate layer of TiC having a thickness of 0.5 to 2.5μ, an intermediate layer, provided between said inner layer and penultimate layer, consisting of a composite layer with a TiN layer having a thickness of 0.5 to 2.5μ sandwiched between TiCN layers each having a thickness of 0.1 to 2.5μ, and an outer layer of Al 2 O 3 with a thickness of 0.5 to 5μ provided on said penultimate layer.
Claim 2
Dependent Claim
104 words
A surface-coated cemented carbide having a hard coating layer on the surface thereof, in which the hard coating layer comprises: an inner layer of TiC having a thickness of 0.5 to 2.5μ, a penultimate layer of TiC having a thickness of 0.5 to 2.5μ, an intermediate layer, provided between said inner layer and penultimate layer, consisting of a composite layer with a TiN layer having a thickness of 0.5 to 2.5μ sandwiched between TiCN layers each having a thickness of 0.1 to 2.5μ, and an outer layer of Al 2 O 3 with a thickness of 0.5 to 5μ provided on said penultimate layer.
Claim 3
Dependent Claim
59 words
The surface-coated cemented carbide article of claim 1, wherein the outermost layer of Al 2 O 3 is coated through a bonding layer coated on the penultimate layer of TiC, the bonding layer consisting of at least one material selected from the group consisting of TiBN, TiCBN, TiCO, TiNO and TiCNO and having a thickness of 0.3 to 1μ.
Claim 4
Dependent Claim
23 words
The surface-coated cemented carbide article of claim 1, wherein the layer of TiC, the intermediate layer and the layer of TiC are repeated.
References Cited (Backward Citations)
US3977061A
Cited
US4019873A
Cited
GB2006727A
Cited
US4237184A
Cited
JPS563670A
Cited
DE3039775A1
Cited
EP0074759A2
Cited
DE3234943A1
Cited
EP0083043A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |