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. 31, 2017
Filed:
Feb. 28, 2012
Sadao Kokubo, Kitakata, JP;
Kazuo Igarashi, Kitakata, JP;
Sadao Kokubo, Kitakata, JP;
Kazuo Igarashi, Kitakata, JP;
SHOWA DENKO K.K., Tokyo, JP;
Abstract
The present invention is directed to a forging method for forming a heat sinkincluding a base boardand a plurality of pin finsintegrally formed on an upper surface of the base board. A back pressure applying pinof a forging die for forming pin finsare slidably arranged in a fin-forming hole. At the time of plastically deforming a forging blank W, a back pressure is applied by the back pressure applying pin to a metal material of the forging blank W flowed into the fin-forming hole. A concave portionis formed on the restraining tip end face of the back pressure applying pinfor restraining the metal material, and a joining convex portionis integrally formed on a tip end of the pin finby the metal material filled in the concave portion