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US5384167A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for the surface treatment of a metal by atmospheric pressure plasma

Assignee: E C CHEMICAL Co Ltd
•
Filing: 1993-03-15
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Granted: 1995-01-24
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Expires: 2013-03-15
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Abstract

Abstract This invention provides a method for the surface treatment of a metal, which comprises the steps of: placing at least a surface to be treated of a metal to be treated between two electrodes facing each other under an atmosphere of a mixed gas consisting of an inert gas and a reactant gas; and plasma exciting said mixed gas under atmospheric pressure to effect glow discharge between said electrodes. The method of the present invention uses an apparatus simpler than that used in a conventional method and can inject into the surface layer of a metal, even those elements which have been difficult to with the conventional method, and can readily modify surface properties of a metal such as surface hardness, surface wettability, etc.

Inventors

  • 👤 Atsushi Nishiwaki
  • 👤 Norihito Ikemiya
  • 👤 Hiroshi Uchiyama
  • 👤 Hideo Inagaki
  • 👤 Yasuo Sawada
  • 👤 Kazumi Ogino

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 19:18
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/36

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 66 words
A method for the surface treatment of a metal, which comprises the steps of: placing at least a surface to be treated of a metal to be treated between two electrodes facing each other under an atmosphere of a mixed gas consisting of an inert gas and a reactant gas; and plasma exciting said mixed gas under atmospheric pressure to effect glow discharge between said electrodes.
Claim 2
Independent Claim 66 words
A method for the surface treatment of a metal, which comprises the steps of: placing at least a surface to be treated of a metal to be treated between two electrodes facing each other under an atmosphere of a mixed gas consisting of an inert gas and a reactant gas; and plasma exciting said mixed gas under atmospheric pressure to effect glow discharge between said electrodes.
Claim 3
Dependent Claim 37 words
The method as claimed in claim 1, wherein said reactant gas is a gas of a carbon-containing compound, a gas of a sulfur-containing compound, a gas of a halogen-containing compound, or a gas of a nitrogen-containing compound.
Claim 4
Dependent Claim 31 words
The method as claimed in claim 2, wherein said reactant gas is a gas of a carbon-containing compound, a gas of a sulfur-containing compound, or a gas of a halogen-containing compound.
Claim 5
Dependent Claim 20 words
The method as claimed in claim 3, wherein said reactant gas is a ketone, a halogenated hydrocarbon or a triazinethiol.
Claim 6
Dependent Claim 18 words
The method as claimed in claim 4, wherein said reactant gas is a acetone, carbon tetrafluoride, or 2-di-butylamino-4,6-dimercapto-s-triazine.
Claim 7
Independent Claim 20 words
The method as claimed in any one of claims 1 to 5, wherein said inert gas is argon or/and helium.
Claim 8
Independent Claim 24 words
The method as claimed in any one of claims 1 to 5, wherein said metal is high carbon steel, soft steel, aluminum or copper.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-01-23 1998-07-25 1999-01-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-01-23 2002-07-25 2003-01-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-01-23 2006-07-25 2007-01-24 $7700.00 Window Closed / Lapsed

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