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:
Nov. 02, 1999
Filed:
Jun. 02, 1998
Applicant:
Inventor:
Tadahiro Ohmi, Aoba-ku, Sendai-shi, Miyagi-ken 980, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
2191 / ; 219 61 ; 219 75 ;
Abstract
A welding method in which the outer-most surfaces of ferritic stainless steel contains chromium oxide surfaces with no iron oxides. The welding method includes flowing a gas having an oxidizing activity over the welded part while applying an arc to the welded part, which is insufficient to melt the welded part. The resulting welded stainless steel is suitable for use as clean room gas supply lines.