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. 08, 2009
Filed:
Feb. 27, 2007
Applicants:
Yukio Iwata, Tokyo, JP;
Shigenori Matsumoto, Tokyo, JP;
Fumio Takemori, Tokyo, JP;
Inventors:
Assignee:
Akebono Brake Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P 15/10 (2006.01); F16D 65/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
By forging a metal material, there is formed a dustproof bootin which a side of an opening end portionformed with a groovefor a dustproof boot is provided with a diameter smaller than that of a side of a piston main body, and a total thereof is provided with a substantially uniform wall thickness, thereafter, by carrying out ironing from a front end of the opening end portionto the piston main body side, the recess groovefor the dustproof boot can be formed by providing a build-up portionat the opening end portion.