Patent US3836392A successfully refreshed from Google Patents.
US3836392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing the resistance to wear of the surface of hard metal cemented carbide parts subject to wear
Assignee: Santrade Ltd
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Filing: 1972-07-05
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Granted: 1974-09-17
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Expires: 1992-07-05
Abstract
Abstract A process for increasing the resistance to wear of the surface of hard metal parts subject to wear, such as the cutting blade of cutting tools, by coating the surface of the hard cemented carbide articles with a layer of refractory oxide such as aluminium oxide, ziroconium oxide or stabilized zirconium oxide in a thickness of up to 20 microns.
Inventors
- 👤 B Lux
- 👤 C Triquet
- 👤 R Funk
- 👤 H Schachner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/403; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A cemented carbide tool as claimed in claim 1, wherein said surface coating has a thickness of between 0.1 and 10 microns.
Claim 2
Dependent Claim
54 words
A cemented carbide tool as claimed in claim 1 wherein said cemented carbide is composed of a carbide of a metal selected from the group consisting of tungsten, titanium, tantalum and niobium, or a mixed carbide of tantalum and niobium; and a binder metal selected from the group consisting of cobalt, iron, and nickel.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |