Patent US4490191A successfully refreshed from Google Patents.
US4490191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated product and process
Assignee: Carboloy Inc
•
Filing: 1981-12-16
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Granted: 1984-12-25
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Expires: 2001-12-16
Abstract
Abstract Improved adherence of oxide wear layers on hard metal or cemented carbide substrates is obtained by providing a thin surface-oxidized bonding layer comprising a carbide or oxycarbide of at least one of tantalum, niobium or vanadium, optionally adding aluminum to the bonding layer, and finally providing an outer oxide wear layer.
Inventors
- 👤 Thomas E. Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:08
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10S428/9265; Y10S428/932; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12576; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12618; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
An article for cutting and wear parts comprising: (i) a hard metal or cemented carbide substrate; (ii) a surface-oxidized bonding layer adjacent the surface of said substrate, which is capable of adherently accepting an oxide overlayer at coating temperatures of from approximately 800° C. to 1300° C., said bonding layer comprising at least one of the carbides or oxycarbides of tantalum, niobium and vanadium; and (iii) an oxide wear layer overlying said bonding layer.
Claim 2
Dependent Claim
74 words
An article for cutting and wear parts comprising: (i) a hard metal or cemented carbide substrate; (ii) a surface-oxidized bonding layer adjacent the surface of said substrate, which is capable of adherently accepting an oxide overlayer at coating temperatures of from approximately 800° C. to 1300° C., said bonding layer comprising at least one of the carbides or oxycarbides of tantalum, niobium and vanadium; and (iii) an oxide wear layer overlying said bonding layer.
Claim 3
Dependent Claim
24 words
An article as defined in claim 1 wherein the substrate is a cemented carbide, and the bonding layer is 0.1 to 0.5 microns thick.
Claim 4
Dependent Claim
13 words
An article as defined in claim 1 wherein bonding layer (ii) includes aluminum.
Claim 5
Dependent Claim
15 words
An article as defined in claim 1 wherein oxide wear layer (iii) comprises aluminum oxide.
Claim 6
Dependent Claim
18 words
An article as defined in claim 1 wherein oxide wear layer (iii) is 0.5 to 20 microns thick.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |