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:
Oct. 31, 2000
Filed:
Jun. 28, 1999
Applicant:
Inventors:
Moriaki Ono, Tokyo, JP;
Tsuyoshi Shiozaki, Tokyo, JP;
Masanori Ohmura, Tokyo, JP;
Yutaka Nagahama, Tokyo, JP;
Akio Sato, Tokyo, JP;
Kenichi Iwazaki, Tokyo, JP;
Yukio Sekine, Tokyo, JP;
Assignee:
NKK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23K / ; C22C / ;
U.S. Cl.
CPC ...
21912164 ; 148333 ; 148909 ;
Abstract
A laser welded steel pipe having a weld zone containing a steel pipe containing 0.01 to 0.2 weight % C, 1 weight % or less S, 0.05 to 2 weight % Mn and 6 weight % or less Mn. The weld zone has a melted and solidified metal structure containing carbon and oxygen which satisfy the following equations: