US4707238A
Expired / Lapsed
US
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Method of processing a metal surface
Assignee: Individual
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Filing: 1986-05-15
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Granted: 1987-11-17
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Expires: 2006-05-15
Abstract
Abstract A primary thin hard coating selected from chrome nitride, titanium nitride and titanium carbide, and a secondary thin coating selected from elemental metals and their corresponding alloys capable of dry-plating are provided on a metal material by an ion-plating technique. The secondary thin coating is provided by ion-plating in the absence of an inert gas, such as argon or helium, which is different from conventional methods for ion-plating the elemental metal in the presence of such inert gas.
Inventors
- 👤 Tadanobu Okubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:30
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/48; C23C14/0015; A; A44; A44C; A44C27/00; A44C27/001; A44C27/005; A44C27/006; A61; A61C; A61C5/00; A61C5/70; A61C5/77; C23C14/06; C23C14/0635; C23C14/0641; C23C14/14; C23C14/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A method of processing a metal article, comprising the steps of: subjecting a metal article having a metal surface to bombardment treatment in the presence of an inert gas; ion-plating onto said metal surface a first layer of a metal compound selected from group consisting of chromium nitride, titanium nitride and titanium carbide, said metal compound being ion-plated in the presence of an active gas; ion-plating an elemental metal or an alloy of said elemental metal onto said metal material having said first layer, to form a second layer of said elemental metal or said alloy thereof, said elemental metal being ion-plated by an arc discharge in the absence of inert gas.
Claim 2
Independent Claim
112 words
A method of processing a metal article, comprising the steps of: subjecting a metal article having a metal surface to bombardment treatment in the presence of an inert gas; ion-plating onto said metal surface a first layer of a metal compound selected from group consisting of chromium nitride, titanium nitride and titanium carbide, said metal compound being ion-plated in the presence of an active gas; ion-plating an elemental metal or an alloy of said elemental metal onto said metal material having said first layer, to form a second layer of said elemental metal or said alloy thereof, said elemental metal being ion-plated by an arc discharge in the absence of inert gas.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the inert gas is argon and the active gas is nitrogen.
Claim 4
Dependent Claim
39 words
A method according to claim 1, wherein the elemental metal is selected from a group consisting of gold, silver, platinum, copper, zinc, palladium, chromium, rhodium, indium, nickel, germanium, cobalt, zirconium, tungsten, tantalum, niobium, manganese, molybdenum, tin, iron, and aluminium.
Claim 5
Dependent Claim
26 words
A method according to claim 1, wherein at least one of said first and second layers is deposited on said metal surface in a desired pattern.
References Cited (Backward Citations)
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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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |