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. 22, 2007
Filed:
Jul. 25, 2003
Applicants:
Yuji Maeda, Hadano, JP;
Sigetomi Miyoshi, Ibaraki, JP;
Takahiro Yamaguchi, Ibaraki, JP;
Inventors:
Assignee:
Taisai Kako Co., Ltd., , JP;
Primary Examiner:
Int. Cl.
CPC ...
B21C 23/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
It is an object of the present invention to provide a novel aluminum tube of an oval cross section that has a wider range of applications and added values. A disk-shaped metal slug () is impact-extruded with the use of a die () and a punch () each having an optimally designed structure to form a metal tube (T) integrally including a mouth, a shoulder and a body of an oval cross section. A hem portion of the oval body of the tube (T) thus formed and hardened by the impact extrusion is once deformed into a circular shape, and then trimmed off by a turning operation.