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. 10, 1989
Filed:
Aug. 12, 1987
Applicant:
Inventors:
Assignee:
Nisshin Steel Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
228144 ; 72 52 ; 72168 ; 72177 ;
Abstract
In a method for making thin-walled metal pipes, application of a pre-deformation to a metal sheet by plastic bending longitudinally perpendicular thereto, and forming the metal sheet into a pipelike shape by use of the widthwise curvature resulting from residual stress of the metal sheet receiving such plastic bending, when its lengthwise curvature is reduced to zero, the metal sheet being joined together at its junction.