The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
Mar. 30, 2000
Yutaka Kimura, Tokyo, JP;
Koji Nakamura, Tokyo, JP;
Nippon Sanso Corporation, Tokyo, JP;
Abstract
A stainless steel pipe which prevents a gas supplied through the pipe from being contaminated so as to maintain high degree of purity, the stainless steel pipe having a superior corrosion resistance so appropriate as to supply the gas for manufacturing semiconductors. According to the present invention, there are provided a stainless steel pipe and a joining method thereof regarding joining by butt welding, the stainless steel pipe comprising a joining portion having a butt joining portion , the butt joining portion having an outer butt joining portion in an outer wall surface portion joined by a butt welding with penetration welding portion W and, an inner butt joining portion in an inner wall surface portion joined in solid-state without being melted, such that the joining portion comprises the butt joining portion joined by the butt welding with partial penetration.