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:
Jan. 19, 1993
Filed:
Sep. 18, 1991
Applicant:
Inventors:
Assignees:
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Sango Co., Nagoya, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
2961 / ; 296188 ; 49502 ; 148320 ; 148909 ; 138171 ;
Abstract
Herein described is a high strength steel pipe for reinforcing doors of a car, comprising a steel pipe made by seam-welding a steel sheet, wherein a ratio (Hv.sub.1 /Hv.sub.2) of a minimum hardness in a softened area of a weld affected zone to an average hardness in a base material satisfies the following formula,