Patent US2473683A successfully refreshed from Google Patents.
Patent US3837896A successfully refreshed from Google Patents.
US3837896A
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Sintered cemented carbide body coated with two layers
Assignee: Sandvik AB
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Filing: 1972-11-03
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Granted: 1974-09-24
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Expires: 1992-11-03
Abstract
Abstract A sintered hard metal body (e.g., a cutting insert) is provided as to wear resistance by depositing thereon an intermediate thin coating of a metallic carbide or metallic nitride free from binder metal and applying over this intermediate coating a thin ceramic coating free from binder metal.
Inventors
- 👤 J Lindstrom
- 👤 B Jonsson
- 👤 F Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:24
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/325; C23C16/34; C23C16/342; C23C16/345; C23C16/36; C23C16/40; C23C16/403; C23C16/405; C23C16/44; C23C16/448; C23C16/4488; C23C30/00; C23C30/005; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12104; Y10T428/12111; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
Compound body as defined in claim 1, wherein said core or substratum is formed of WC, cubic carbides and Co and said inner layer is formed of titanium carbide and has a thickness of about 2 Mu m and said outer layer is formed of Al2O3 and has a thickness of about 2 Mu m.
Claim 2
Dependent Claim
61 words
Compound body as defined in claim 1, wherein said bore or substratum is formed of WC, cubic carbides and Co and said inner layer is formed of titanium nitride with a minor amount of TiC and has a thickness of about 3 Mu m and said outer layer is formed of ZrO2 and has a thickness of about 5 Mu m.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |