Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate
2006-02-21
2006-02-21
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
C419S036000
Reexamination Certificate
active
07001570
ABSTRACT:
A metal-made seamless pipe is provided, containing at least one metal selected from the group consisting of metals each having a melting point of 1,600° C. or more, and has a porosity of 0.3 to 25%. The porosity is defined as a ratio of the open pores present at the outer surface of the pipe to the total surface area of the outer surface of the pipe. The open pores do not include through-pores perforating to the inner surface of the pipe. A process for producing such a metal-made seamless pipe is also provided. The metal-made seamless pipe is low in processability but can be produced having a small thickness and a small inner diameter, having superior mechanical strength and gastightness, and can be suitably used as a sealing member of a translucent vessel of a high-pressure discharge lamp.
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Burr & Brown
Jenkins Daniel
NGK Insulators Ltd.
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