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:
Sep. 16, 2014
Filed:
Jul. 28, 2011
Applicants:
Taiki Ogura, Hirakata, JP;
Tatsushi Itou, Hirataka, JP;
Inventors:
Taiki Ogura, Hirakata, JP;
Tatsushi Itou, Hirataka, JP;
Assignee:
Komatsu Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D 26/02 (2011.01); B21D 22/12 (2006.01); B21C 37/29 (2006.01); B21D 35/00 (2006.01); B21D 28/28 (2006.01);
U.S. Cl.
CPC ...
B21D 22/125 (2013.01); B21C 37/294 (2013.01); B21D 35/001 (2013.01); B21D 28/28 (2013.01);
Abstract
A method of manufacturing a branched pipe includes: a first swelling step of swelling a swelled part from a main body of a pipe blank by pressurizing the inner surface of the pipe blank by an elastic body, and simultaneously, forming an opening in the tip portion of the swelled part along a circumferential direction; and a second swelling step of swelling the swelled part from the main body by pressurizing the inner surface of the pipe blank by the elastic body.