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:
May. 03, 2016
Filed:
Mar. 03, 2015
Topre Corporation, Tokyo, JP;
Mikio Takada, Kanagawa, JP;
TOPRE CORPORATION, Kanagawa, JP;
Abstract
A square pipe manufacturing method includes: a first processing step of forming a first intermediate formed productby bending both widthwise end portions of a rectangular metal plate; a second processing step of forming a second intermediate formed productby bending both widthwise sides of a bottom surfaceof the first intermediate formed product; a third processing step of obtaining a third intermediate formed productby curving the side wall surfacesto be convex outward in the width direction by pressing the flange partstoward the bottom wall surfaceand then pressing the curved side wall surfacesinward in the width direction; and a fourth processing step of crush-deforming cornersof the third intermediate formed product