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. 07, 2010
Filed:
Oct. 21, 2008
Applicant:
Chihiro Hayashi, Miyagi, JP;
Inventor:
Chihiro Hayashi, Miyagi, JP;
Assignee:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21C 1/24 (2006.01); B21D 39/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a method of producing an ultra thin wall metallic tube by a cold drawing process in which a drawing machine is used, a wall thickness of the metallic tube is reduced to perform drawing while a tube-wall centerline diameter of a tube material is expanded, using a solid die which gradually increases in diameter from its engaging inlet side toward its work-ending outlet side and a plug or a tapered mandrel bar which gradually increases in diameter over a corresponding distance from the engaging inlet side of the solid die toward the work-ending outlet side of the solid die, whereby the wall thickness can dramatically be reduced.